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Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Preferred Stock, Common Stock, Treasury Stock and Warrants Narrative) (Details)

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Stockholders' Equity (Preferred Stock, Common Stock, Treasury Stock and Warrants Narrative) (Details) - USD ($)
 3 Months Ended
Jul. 31, 2018
Jul. 19, 2018
Apr. 30, 2018
Stockholders Equity [Line Items]      
Preferred stock, shares authorized 10,000,000   10,000,000
Preferred stock, shares issued 0   0
Preferred stock, shares outstanding 0   0
Per share price $ 0.001   $ 0.001
Stock issuance costs paid by third parties $ 30,000    
Preferred Stock [Member]      
Stockholders Equity [Line Items]      
Preferred stock, shares authorized 10,000,000   10,000,000
Preferred stock, shares issued 0   0
Preferred stock, shares outstanding 0   0
Common Stock [Member]      
Stockholders Equity [Line Items]      
Share issued in exercise of stock options 2,689    
Proceeds from stock options exercised $ 7,817    
Treasury stock repurchased   1,000,000  
Per share price   $ 7.40  
Sale of common stock per share price   $ 7.40  
Common Stock [Member] | Cashless Exercise of Stock Options [Member]      
Stockholders Equity [Line Items]      
Share issued in exercise of stock options 5,230