Quarterly report pursuant to Section 13 or 15(d)

Related party (Narrative) (Details)

v3.10.0.1
Related party (Narrative) (Details) - $ / shares
Oct. 31, 2018
Jul. 19, 2018
Apr. 30, 2018
Related Party Transaction [Line Items]      
Per share price $ 0.001   $ 0.001
Common Stock [Member]      
Related Party Transaction [Line Items]      
Treasury stock repurchased   1,000,000  
Per share price   $ 7.40  
Sale of common stock per share price   $ 7.40