Quarterly report pursuant to Section 13 or 15(d)

Nature of Operations and Liquidity (Liquidity) (Details)

v3.19.2
Nature of Operations and Liquidity (Liquidity) (Details) - USD ($)
3 Months Ended
Mar. 06, 2019
Jul. 31, 2019
Jul. 31, 2018
Apr. 30, 2019
Nov. 05, 2018
Product Information [Line Items]          
Approximate cash position   $ 7,243,580 $ 10,423,660 $ 9,519,352  
Restricted cash   452,021   $ 448,400  
Cash used in operating activities   1,685,083 3,388,210    
Cash used during period   $ 2,272,151 $ 4,188,899    
Loan Agreements [Member] | Leon and Toby Cooperman Family Foundation [Member]          
Product Information [Line Items]          
Proceeds from debt $ 10,000,000        
Commitment fee percentage, payable quarterly 1.00%        
Loan Agreement One [Member]          
Product Information [Line Items]          
Loan agreement principal amount $ 5,000,000        
Loan Agreement Two [Member]          
Product Information [Line Items]          
Loan agreement principal amount $ 5,000,000        
Revolving Credit Facility [Member]          
Product Information [Line Items]          
Line of credit maximum borrowing capacity         $ 5,000,000