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SHAREHOLDERS' EQUITY, Equity Compensation Plan (Details) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 15, 2020 BoardMember $ / shares shares | Sep. 27, 2019 $ / shares shares | Sep. 25, 2019 $ / shares shares | May 31, 2020 USD ($) $ / shares shares | May 31, 2019 USD ($) | May 31, 2020 USD ($) $ / shares shares | May 31, 2019 USD ($) | Aug. 31, 2019 USD ($) $ / shares shares
Stock Options [Abstract] |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  | $ 81,900 | $ 96,100 | $ 435,109 | $ 257,813 |
Non Employee [Member] |  |  |  |  |  |  |  |
Number of Options [Roll Forward] |  |  |  |  |  |  |  |
Granted (in shares) | shares | 2,000 |  |  |  |  |  |  |
Stock Options [Abstract] |  |  |  |  |  |  |  |
Number of board members | BoardMember | 6 |  |  |  |  |  |  |
Stock price (in dollars per share) | $ / shares | $ 12.45 |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  | $ 0 | 0 | $ 149,400 | 0 |
2014 Equity Plan [Member] |  |  |  |  |  |  |  |
Shareholders' Equity [Abstract] |  |  |  |  |  |  |  |
Reserved shares of common stock for issuance (in shares) | shares |  |  |  | 1,600,000 |  | 1,600,000 |  |
2004 Incentive Plan and 2014 Equity Plan [Member] |  |  |  |  |  |  |  |
Number of Options [Roll Forward] |  |  |  |  |  |  |  |
Outstanding, beginning of period (in shares) | shares |  |  |  |  |  | 555,500 |  |
Granted (in shares) | shares |  |  |  |  |  | 130,000 |  |
Exercised (in shares) | shares |  |  |  |  |  | (15,000) |  |
Forfeited or expired (in shares) | shares |  |  |  |  |  | 0 |  |
Outstanding, end of period (in shares) | shares |  |  |  | 670,500 |  | 670,500 |  | 555,500
Options exercisable (in shares) | shares |  |  |  | 490,500 |  | 490,500 |  |
Weighted Average Exercise Price [Roll Forward] |  |  |  |  |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ / shares |  |  |  |  |  | $ 6.33 |  |
Granted (in dollars per share) | $ / shares |  |  |  |  |  | 10.41 |  |
Exercised (in dollars per share) | $ / shares |  |  |  |  |  | 2.67 |  |
Forfeited or expired (in dollars per share) | $ / shares |  |  |  |  |  | 0 |  |
Outstanding, end of period (in dollars per share) | $ / shares |  |  |  | $ 7.20 |  | 7.20 |  | $ 6.33
Options exercisable (in dollars per share) | $ / shares |  |  |  | $ 6.07 |  | $ 6.07 |  |
Stock Options [Abstract] |  |  |  |  |  |  |  |
Weighted average remaining contractual term |  |  |  |  |  | 6 years 4 months 13 days |  | 6 years 3 months 7 days
Weighted average remaining contractual term, options exercisable |  |  |  |  |  | 5 years 5 months 1 day |  |
Approximate aggregate intrinsic value, outstanding | $ |  |  |  | $ 2,066,420 |  | $ 2,066,420 |  | $ 2,527,590
Approximate aggregate intrinsic value, options exercisable | $ |  |  |  | 2,023,755 |  | $ 2,023,755 |  |
Weighted average grant-date fair value (in dollars per share) | $ / shares |  |  |  |  |  | $ 4.19 |  |
Share-based compensation expense | $ |  |  |  | $ 81,900 | $ 96,100 | $ 435,100 | $ 257,800 |
2004 Incentive Plan and 2014 Equity Plan [Member] | Senior Management [Member] |  |  |  |  |  |  |  |
Number of Options [Roll Forward] |  |  |  |  |  |  |  |
Granted (in shares) | shares |  | 50,000 |  |  |  |  |  |
Stock Options [Abstract] |  |  |  |  |  |  |  |
Weighted average grant-date fair value (in dollars per share) | $ / shares |  | $ 4.16 |  |  |  |  |  |
Vesting period |  |  |  |  |  | 3 years |  |
2004 Incentive Plan and 2014 Equity Plan [Member] | Senior Management [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Stock Options [Abstract] |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  | 10 years |  |
2004 Incentive Plan and 2014 Equity Plan [Member] | Employee [Member] |  |  |  |  |  |  |  |
Number of Options [Roll Forward] |  |  |  |  |  |  |  |
Granted (in shares) | shares |  |  | 80,000 |  |  |  |  |
Stock Options [Abstract] |  |  |  |  |  |  |  |
Weighted average grant-date fair value (in dollars per share) | $ / shares |  |  | $ 4.21 |  |  |  |  |
Vesting period |  |  |  |  |  | 3 years |  |
2004 Incentive Plan and 2014 Equity Plan [Member] | Employee [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Stock Options [Abstract] |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  | 10 years |  |

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