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SHAREHOLDERS` EQUITY (Tables) | 12 Months Ended
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May 31, 2018
Stockholders' Equity Note [Abstract] |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
| NUMBER OF STOCK OPTIONS |  | PRICE RANGE PER SHARE |  | WEIGHTED AVERAGE EXERCISE PRICE
Options outstanding at May 31, 2016 | 1,199,000 |  | $ 0.43-$ 1.20 |  | $ | 0.81
Options granted | 55,000 |  | $ 1.52-$ 1.61 |  | $ | 1.55
Options exercised | (341,500) |  | $ 0.43-$ 1.04 |  | $ | 0.46
Options canceled or expired | (15,500) |  | $ 0.43-$ 1.04 |  | $ | 0.90
Options outstanding at May 31, 2017 | 897,000 |  | $ 0.71-$ 1.61 |  | $ | 0.98
Options granted | 287,000 |  | $ 2.41-$3.90 |  | $ | 3.63
Options exercised | (34,750) |  | $ 0.71-$ 1.04 |  | $ | 0.80
Options canceled or expired | (10,625) |  | $ 0.71-$ 2.41 |  | $ | 1.44
Options outstanding at May 31, 2018 | 1,138,625 |  | $ 0.71-$ 3.90 |  | $ | 1.65
Schedule of Nonvested Share Activity [Table Text Block] |
|  |  | STOCK OPTIONS WEIGHTED AVERAGE AVERAGE GRANT DATE FAIR VALUE
| NUMBER OF SHARES |
Nonvested shares at May 31, 2017 | 517,250 |  | $ | 0.96
Granted | 287,000 |  | $ | 3.63
Vested/Exercised | (212,125) |  | $ | 1.00
Forfeited | (9,125) |  | $ | 1.56
Nonvested shares at May 31, 2018 | 583,000 |  | $ | 2.34
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  | WEIGHTED AVERAGE REMAINING CONTRACTUAL LIFE IN YEARS |  |  |
|  | WEIGHTED AVERAGE EXERCISE PRICE | NUMBER EXERCISABLE AT MAY 31, 2018 |
| NUMBER OUTSTANDING 05/31/2018 | WEIGHTED AVERAGE EXERCISE PRICE
RANGE OF EXERCISE PRICES
$ 0.71-$ 0.84 | 460,625 | 4.66 | $0.80 | 371,750 | $0.79
$ 0.85-$ 1.04 | 65,000 | 2.22 | $0.99 | 32,625 | $0.98
$ 1.20-$ 1.61 | 330,000 | 8.32 | $1.26 | 151,250 | $1.23
$ 2.41-$ 3.90 | 283,000 | 8.69 | $3.65 | -- | --

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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