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Note 9 - Stock-based Compensation (Tables) | 12 Months Ended
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Jun. 30, 2018
Notes Tables |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Year Ended June 30, |
|  | 2018 |  |  | 2017 |
|  |  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |
|  | Shares |  |  | Average |  |  | Shares |  |  | Average |
|  | Under |  |  | Exercise |  |  | Under |  |  | Exercise |
|  | Options |  |  | Price |  |  | Options |  |  | Price |
Outstanding, beginning of year |  |  | 265,000 |  |  | $ | 10.00 |  |  |  | 405,000 |  |  | $ | 10.24 |
Granted |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Exercised |  |  | (229,375) |  |  | $ | 10.00 |  |  |  | (140,000) |  |  | $ | 10.69 |
Forfeited |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Cancelled |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Outstanding, end of year |  |  | 35,625 |  |  | $ | 10.01 |  |  |  | 265,000 |  |  | $ | 10.00 |
Aggregate intrinsic value |  | $ | 454,937 |  |  |  |  |  |  | $ | 2,232,848 |  |  |  |  |
Exercisable, end of year |  |  | 35,625 |  |  | $ | 10.01 |  |  |  | 265,000 |  |  | $ | 10.00 |
Aggregate intrinsic value |  | $ | 454,937 |  |  |  |  |  |  | $ | 2.232,848 |  |  |  |  |
Available for grant, end of year |  |  | 384,094 |  |  |  |  |  |  |  | 39,094 |  |  |  |  |
Weighted average fair value of options granted during the year (1) |  | $ | — |  |  |  |  |  |  | $ | — |  |  |  |  |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  | Options Outstanding |  |  | Options Exercisable |
|  |  |  | Number of |  |  | Weighted |  |  |  |  |  |  | Number of |  |  | Weighted |  |  |  |  |
|  |  |  | Shares |  |  | Average |  |  | Weighted |  |  | Shares |  |  | Average |  |  | Weighted |
|  |  |  | Under |  |  | Remaining |  |  | Average |  |  | Under |  |  | Remaining |  |  | Average |
Range of Exercise |  | Outstanding |  |  | Contractual |  |  | Exercise |  |  | Outstanding |  |  | Contractual |  |  | Exercise |
Price |  | Options |  |  | Life |  |  | Price |  |  | Options |  |  | Life |  |  | Price |
$10.00 | - | $10.99 |  |  | 35,625 |  |  |  | 0.2 |  |  | $ | 10.01 |  |  |  | 35,625 |  |  |  | 0.2 |  |  | $ | 10.01 |
Nonvested Restricted Stock Shares Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Fair Value Per Share |
Nonvested balance at June 30, 2016 |  |  | 102,332 |  |  | $ | 4.54 |
Granted |  |  | 175,000 |  |  | $ | 21.29 |
Vested |  |  | (78,335 | ) |  | $ | 10.22 |
Forfeited |  |  | — |  |  | $ | — |
Nonvested balance at June 30, 2017 |  |  | 198,997 |  |  | $ | 17.03 |
Granted |  |  | 155,000 |  |  | $ | 19.50 |
Vested |  |  | (54,999 | ) |  | $ | 11.72 |
Forfeited |  |  | — |  |  | $ | — |
Nonvested balance at June 30, 2018 |  |  | 298,998 |  |  | $ | 19.12 |

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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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