Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY

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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
Total
Common Stock
Additional Paid-In Capital
Treasury Stock
Accumulated Deficit
Beginning balance at Apr. 30, 2018 $ 33,733,591 $ 18,334 $ 66,557,005 $ (70,000) $ (32,771,748)
Beginning balance (in shares) at Apr. 30, 2018   18,333,521      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 515,291   515,291    
Common stock issued for cashless stock options exercised 0 $ 31 (31)    
Common stock issued for cashless stock options exercised (in shares)   30,764      
Common stock issued for stock options exercised for cash 60,102 $ 26 60,076    
Common stock issued for stock options exercised for cash (in shares)   26,807      
Purchase of treasury stock, net of broker fees (7,370,000)     (7,370,000)  
Re-sale of treasury stock, net of broker fees 7,370,000     7,370,000  
Fees associated with equity raise (29,832)   (29,832)    
Net loss (5,312,354)       (5,312,354)
Ending balance at Oct. 31, 2018 28,966,798 $ 18,391 67,102,509 (70,000) (38,084,102)
Ending balance (in shares) at Oct. 31, 2018   18,391,092      
Beginning balance at Jul. 31, 2018 31,084,276 $ 18,341 66,744,959 (70,000) (35,609,024)
Beginning balance (in shares) at Jul. 31, 2018   18,341,440      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 305,315   305,315    
Common stock issued for cashless stock options exercised 0 $ 26 (26)    
Common stock issued for cashless stock options exercised (in shares)   25,534      
Common stock issued for stock options exercised for cash 52,285 $ 24 52,261    
Common stock issued for stock options exercised for cash (in shares)   24,118      
Net loss (2,475,078)       (2,475,078)
Ending balance at Oct. 31, 2018 28,966,798 $ 18,391 67,102,509 (70,000) (38,084,102)
Ending balance (in shares) at Oct. 31, 2018   18,391,092      
Beginning balance at Apr. 30, 2019 26,461,428 $ 18,666 68,562,727 (70,000) (42,049,965)
Beginning balance (in shares) at Apr. 30, 2019   18,665,551      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Common stock issued for cashless stock options exercised (in shares)   101,894      
Common stock issued for stock options exercised for cash 45,190        
Common stock issued for stock options exercised for cash (in shares)   21,876      
Common stock issued for cashless warrant exercise (in shares)   19,403      
Ending balance at Jul. 31, 2019 24,969,790 $ 18,914 69,146,123 (70,000) (44,125,247)
Ending balance (in shares) at Jul. 31, 2019   18,913,527      
Beginning balance at Apr. 30, 2019 26,461,428 $ 18,666 68,562,727 (70,000) (42,049,965)
Beginning balance (in shares) at Apr. 30, 2019   18,665,551      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 889,484   889,484    
Common stock issued for cashless stock options exercised 0 $ 182 (182)    
Common stock issued for cashless stock options exercised (in shares)   182,207      
Common stock issued for stock options exercised for cash 237,713 $ 113 237,600    
Common stock issued for stock options exercised for cash (in shares)   112,826      
Common stock issued for cashless warrant exercise 0 $ 77 (77)    
Common stock issued for cashless warrant exercise (in shares)   76,929      
Amortization of warrant based cost 18,565   18,565    
Amortization of restricted stock issued for services 73,350   73,350    
Restricted Stock Issued for Services, subject to vesting 0 $ 104 (104)    
Restricted Stock Issued for Services, subject to vesting (in shares)   104,803      
Net loss (2,713,450)       (2,713,450)
Ending balance at Oct. 31, 2019 24,967,090 $ 19,142 69,781,363 (70,000) (44,763,415)
Ending balance (in shares) at Oct. 31, 2019   19,142,316      
Beginning balance at Jul. 31, 2019 24,969,790 $ 18,914 69,146,123 (70,000) (44,125,247)
Beginning balance (in shares) at Jul. 31, 2019   18,913,527      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 391,067   391,067    
Common stock issued for cashless stock options exercised 0 $ 80 (80)    
Common stock issued for cashless stock options exercised (in shares)   80,313      
Common stock issued for stock options exercised for cash 192,522 $ 90 192,432    
Common stock issued for stock options exercised for cash (in shares)   90,950      
Common stock issued for cashless warrant exercise 0 $ 58 (58)    
Common stock issued for cashless warrant exercise (in shares)   57,526      
Amortization of warrant based cost 9,125   9,125    
Amortization of restricted stock issued for services 42,754   42,754    
Net loss (638,168)       (638,168)
Ending balance at Oct. 31, 2019 $ 24,967,090 $ 19,142 $ 69,781,363 $ (70,000) $ (44,763,415)
Ending balance (in shares) at Oct. 31, 2019   19,142,316