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Note C - Shareholders' Equity (Tables) | 12 Months Ended
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Sep. 30, 2018
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year ended September 30, 2018
Dividend yield |  |  | 0 | %
Weighted average expected volatility |  |  | 43.68 | %
Weighted average risk-free interest rate |  |  | 2.70 | %
Weighted average expected life |  |  | 3.7 | years
Vesting period |  |  | 3.0 | years
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  |  | Number of shares |  |  |  | Weighted average exercise price |  |  |  | Weighted average fair value |
Outstanding as of September 30, 2016 |  |  | 54,800 |  |  | $ | 3.13 |  |  |  |  |
Granted |  |  | - |  |  |  | - |  |  |  | - |
Cancelled or Forfeited |  |  | - |  |  |  | - |  |  |  |  |
Exercised |  |  | (15,850 | ) |  |  | 3.97 |  |  |  |  |
Outstanding as of September 30, 2017 |  |  | 38,950 |  |  |  | 2.79 |  |  |  |  |
Granted |  |  | 108,000 |  |  |  | 13.37 |  |  | $ | 4.78 |
Cancelled or Forfeited |  |  | - |  |  |  | - |  |  |  |  |
Exercised |  |  | (8,450 | ) |  |  | 3.58 |  |  |  |  |
Outstanding as of September 30, 2018 |  |  | 138,500 |  |  | $ | 10.99 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable [Table Text Block] |
Year ended |  |  | Exercisable |  |  |  | Weighted average remaining contractual life |  |  |  | Weighted average exercise price |
September 30, 2018 |  |  | 30,500 |  |  | 1.89 years |  | $ | 2.58 |
September 30, 2017 |  |  | 38,950 |  |  | 2.73 years |  | $ | 2.79 |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block] |
Year Ended |  |  | Number outstanding |  |  |  | Weighted average remaining contractual life |  |  |  | Weighted average exercise price |  |  |  | Aggregate intrinsic value |
September 30, 2018 |  |  | 138,500 |  |  | 3.82 years |  | $ | 10.99 |  |  | $ | 340,531 |
September 30, 2017 |  |  | 38,950 |  |  | 2.73 years |  | $ | 2.79 |  |  | $ | 421,237 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  |  | Number of shares |  |  |  | Weighted average grant date fair value |
Unvested shares as of September 30, 2016 |  |  | 563,570 |  |  | $ | 14.26 |
Granted |  |  | 3,795 |  |  |  | 16.45 |
Vested |  |  | (185,231 | ) |  |  | 12.30 |
Forfeited |  |  | (11,604 | ) |  |  | 14.79 |
Unvested shares as of September 30, 2017 |  |  | 370,530 |  |  |  | 15.24 |
Granted |  |  | 7,235 |  |  |  | 14.17 |
Vested |  |  | (113,930 | ) |  |  | 16.45 |
Forfeited |  |  | (15,222 | ) |  |  | 15.41 |
Unvested shares as of September 30, 2018 |  |  | 248,613 |  |  | $ | 14.65 |

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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -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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