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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)

v3.10.0.1
Stockholders' Equity (Preferred Stock, Common Stock, Treasury Stock and Warrants Narrative) (Details) - USD ($)
6 Months Ended
Sep. 06, 2018
Oct. 31, 2018
Oct. 31, 2017
Jul. 19, 2018
Apr. 30, 2018
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý
Preferred stock, shares authorized Ìý 10,000,000 Ìý Ìý 10,000,000
Preferred stock, shares issued Ìý 0 Ìý Ìý 0
Preferred stock, shares outstanding Ìý 0 Ìý Ìý 0
Share issued in exercise of stock options Ìý 26,807 Ìý Ìý Ìý
Proceeds from stock options exercised Ìý $ 60,102 $ 53,045 Ìý Ìý
Per share price Ìý $ 0.001 Ìý Ìý $ 0.001
Stock issuance costs paid by third parties Ìý $ 30,000 Ìý Ìý Ìý
Compensation cost of unvested shares yet to be recognized, period of recognition Ìý 3 years Ìý Ìý Ìý
Chief Financial Officer [Member] Ìý Ìý Ìý Ìý Ìý
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý
Compensation cost of unvested shares yet to be recognized, period of recognition 5 years Ìý Ìý Ìý Ìý
Restricted Stock [Member] | Chief Financial Officer [Member] Ìý Ìý Ìý Ìý Ìý
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý
Restricted shares granted 25,000 Ìý Ìý Ìý Ìý
Award vesting period 36 months Ìý Ìý Ìý Ìý
Compensation cost of unvested shares yet to be recognized $ 180,000 Ìý Ìý Ìý Ìý
Compensation cost of unvested shares yet to be recognized, period of recognition 36 months Ìý Ìý Ìý Ìý
Market price of company stock $ 7.17 Ìý Ìý Ìý Ìý
Cashless Exercise of Stock Options [Member] Ìý Ìý Ìý Ìý Ìý
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý
Share issued in exercise of stock options Ìý 30,764 Ìý Ìý Ìý
Preferred Stock [Member] Ìý Ìý Ìý Ìý Ìý
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý
Preferred stock, shares authorized Ìý 10,000,000 Ìý Ìý 10,000,000
Preferred stock, shares issued Ìý 0 Ìý Ìý 0
Preferred stock, shares outstanding Ìý 0 Ìý Ìý 0
Common Stock [Member] Ìý Ìý Ìý Ìý Ìý
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý
Share issued in exercise of stock options Ìý 26,807 Ìý Ìý Ìý
Proceeds from stock options exercised Ìý $ 60,102 Ìý Ìý Ìý
Treasury stock repurchased Ìý Ìý Ìý 1,000,000 Ìý
Per share price Ìý Ìý Ìý $ 7.40 Ìý
Sale of common stock per share price Ìý Ìý Ìý $ 7.40 Ìý
Common Stock [Member] | Cashless Exercise of Stock Options [Member] Ìý Ìý Ìý Ìý Ìý
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý
Share issued in exercise of stock options Ìý 30,764 Ìý Ìý Ìý