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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)

v3.19.1
Stockholders' Equity (Preferred Stock, Common Stock, Treasury Stock and Warrants Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 06, 2018
Dec. 24, 2018
Jan. 31, 2019
Jan. 31, 2019
Jan. 31, 2018
Jul. 19, 2018
Apr. 30, 2018
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Preferred stock, shares authorized Ìý Ìý 10,000,000 10,000,000 Ìý Ìý 10,000,000
Preferred stock, shares issued Ìý Ìý 0 0 Ìý Ìý 0
Preferred stock, shares outstanding Ìý Ìý 0 0 Ìý Ìý 0
Share issued in exercise of stock options Ìý Ìý Ìý 49,792 Ìý Ìý Ìý
Proceeds from stock options exercised Ìý Ìý Ìý $ 110,143 $ 598,876 Ìý Ìý
Per share price Ìý Ìý $ 0.001 $ 0.001 Ìý Ìý $ 0.001
Stock issuance costs paid by third parties Ìý Ìý Ìý $ 30,000 Ìý Ìý Ìý
Compensation cost of unvested shares yet to be recognized, period of recognition Ìý Ìý Ìý 3 years Ìý Ìý Ìý
Chief Financial Officer [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Compensation cost of unvested shares yet to be recognized, period of recognition 5 years Ìý Ìý Ìý Ìý Ìý Ìý
Restricted Stock [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Restricted shares granted, value Ìý $ 127,000 Ìý Ìý Ìý Ìý Ìý
Award vesting period Ìý 36 months Ìý Ìý Ìý Ìý Ìý
Shares granted Ìý 24,672 Ìý Ìý Ìý Ìý Ìý
Vesting period Ìý The restricted shares shall vest in three equal annual increments on December 24, 2019, December 24, 2020 and December 24, 2021. Ìý Ìý Ìý Ìý Ìý
Restricted Stock [Member] | Chief Financial Officer [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Restricted shares granted 25,000 Ìý Ìý Ìý Ìý Ìý Ìý
Award vesting period 36 months Ìý Ìý Ìý Ìý Ìý Ìý
Compensation cost of unvested shares yet to be recognized $ 180,000 Ìý Ìý Ìý Ìý Ìý Ìý
Compensation cost of unvested shares yet to be recognized, period of recognition 36 months Ìý Ìý Ìý Ìý Ìý Ìý
Market price of company stock $ 7.15 Ìý Ìý Ìý Ìý Ìý Ìý
Restricted Stock [Member] | Director [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Officers compensation Ìý $ 35,000 Ìý Ìý Ìý Ìý Ìý
Cashless Exercise of Stock Options [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Share issued in exercise of stock options Ìý Ìý Ìý 86,635 Ìý Ìý Ìý
Preferred Stock [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Preferred stock, shares authorized Ìý Ìý 10,000,000 10,000,000 Ìý Ìý 10,000,000
Preferred stock, shares issued Ìý Ìý 0 0 Ìý Ìý 0
Preferred stock, shares outstanding Ìý Ìý 0 0 Ìý Ìý 0
Common Stock [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Share issued in exercise of stock options Ìý Ìý Ìý 49,792 Ìý Ìý Ìý
Proceeds from stock options exercised Ìý Ìý Ìý $ 110,143 Ìý Ìý Ìý
Treasury stock repurchased Ìý Ìý Ìý Ìý Ìý 1,000,000 Ìý
Per share price Ìý Ìý Ìý Ìý Ìý $ 7.40 Ìý
Sale of common stock per share price Ìý Ìý Ìý Ìý Ìý $ 7.40 Ìý
Common Stock [Member] | Cashless Exercise of Stock Options [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Share issued in exercise of stock options Ìý Ìý Ìý 86,635 Ìý Ìý Ìý
Warrant [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Share issued in exercise of stock options Ìý Ìý 35,921 35,921 Ìý Ìý Ìý
Warrants issued Ìý Ìý Ìý 92,049 Ìý Ìý Ìý
Warrant exercise price Ìý Ìý $ 5.85 $ 5.85 Ìý Ìý Ìý
Warrant term Ìý Ìý Ìý 5 years Ìý Ìý Ìý
Warrant [Member] | Cashless Exercise of Stock Options [Member] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Stockholders Equity [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Share issued in exercise of stock options Ìý Ìý 64,375 64,375 Ìý Ìý Ìý