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Note 2 - Stock Based Compensation (Tables) | 12 Months Ended
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Sep. 30, 2023
Notes Tables |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year ended September 30, 2023 |  |  | Year ended September 30, 2022 |  |  | Year ended September 30, 2021 |
Dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Weighted average expected volatility |  |  | 63.14 | % |  |  | 52.02 | % |  |  | 46.90 | %
Weighted average risk-free interest rate |  |  | 3.75 | % |  |  | 0.97 | % |  |  | 0.24 | %
Weighted average expected life |  | 5 years |  |  | 5 years |  |  | 5 years |
Vesting period |  | 3 years |  |  | 3 years |  |  | 3 years |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of shares |  |  | Weighted average exercise price |  |  | Weighted average fair value |
Outstanding as of September 30, 2020 |  |  | 337,100 |  |  | $ | 12.48 |  |  |  |  |
Granted |  |  | 105,089 |  |  |  | 23.74 |  |  | $ | 8.14 |
Exercised |  |  | (101,966 | ) |  |  | 12.47 |  |  |  |  |
Forfeited and expired |  |  | (38,709 | ) |  |  | 13.68 |  |  |  |  |
Outstanding as of September 30, 2021 |  |  | 301,514 |  |  | $ | 16.25 |  |  |  |  |
Granted |  |  | 62,730 |  |  |  | 66.48 |  |  | $ | 25.54 |
Exercised |  |  | (125,651 | ) |  |  | 12.92 |  |  |  |  |
Forfeited and expired |  |  | (2,084 | ) |  |  | 19.94 |  |  |  |  |
Outstanding as of September 30, 2022 |  |  | 236,509 |  |  | $ | 31.30 |  |  |  |  |
Granted |  |  | 40,266 |  |  |  | 64.38 |  |  | $ | 30.83 |
Exercised |  |  | (21,630 | ) |  |  | 26.16 |  |  |  |  |
Forfeited and expired |  |  | (1,021 | ) |  |  | 18.18 |  |  |  |  |
Outstanding as of September 30, 2023 |  |  | 254,124 |  |  | $ | 37.04 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable [Table Text Block] |
As of Year Ended |  | Exercisable |  | Weighted average remaining contractual life |  | Weighted average exercise price |  |  | Aggregate intrinsic value (in thousands) |
September 30, 2023 |  |  | 97,056 |  | 2.28 years |  | $ | 28.13 |  |  | $ | 2,731 |
September 30, 2022 |  |  | 39,276 |  | 2.78 years |  | $ | 20.26 |  |  | $ | 3,314 |
September 30, 2021 |  |  | 51,201 |  | 2.29 years |  | $ | 12.28 |  |  | $ | 1,632 |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block] |
As of Year Ended |  | Number outstanding |  | Weighted average remaining contractual life |  | Weighted average exercise price |  |  | Aggregate intrinsic value (in thousands) |
September 30, 2023 |  |  | 254,124 |  | 2.72 years |  | $ | 37.04 |  |  | $ | 9,413 |
September 30, 2022 |  |  | 236,509 |  | 3.30 years |  | $ | 31.30 |  |  | $ | 17,343 |
September 30, 2021 |  |  | 301,514 |  | 3.22 years |  | $ | 16.25 |  |  | $ | 8,412 |
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  | Number of shares |  |  | Weighted average grant date fair value |
Unvested shares as of September 30, 2020 |  |  | 109,070 |  |  | $ | 12.98 |
Granted |  |  | 39,807 |  |  |  | 24.20 |
Vested |  |  | (35,840 | ) |  |  | 12.48 |
Forfeited |  |  | (4,198 | ) |  |  | 15.45 |
Unvested shares as of September 30, 2021 |  |  | 108,839 |  |  | $ | 17.14 |
Granted |  |  | 29,512 |  |  |  | 65.90 |
Vested |  |  | (37,094 | ) |  |  | 17.78 |
Forfeited |  |  | (2,749 | ) |  |  | 16.84 |
Unvested share, s as of September 30, 2022 |  |  | 98,508 |  |  | $ | 31.51 |
Granted |  |  | 41,492 |  |  |  | 70.50 |
Vested |  |  | (47,869 | ) |  |  | 30.98 |
Forfeited |  |  | (1,556 | ) |  |  | 15.61 |
Unvested shares as of September 30, 2023 |  |  | 90,575 |  |  | $ | 49.92 |

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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 -Topic 718 -SubTopic 10 -Subparagraph (e)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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