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Note 2 - Stock Based Compensation (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended | 18 Months Ended |
--- | --- | --- | --- | ---
Feb. 29, 2020 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2022 | Feb. 23, 2023
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 4,445,000 |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  | 2 years 10 months 24 days |  |  |  |  |
Share-Based Payment Arrangement, Expense |  | $ 3,578,000 |  | $ 2,339,000 | $ 1,280,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  | 40,266 |  | 62,730 | 105,089 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  | 5 years |  |  | 5 years |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  | 3 years |  | 3 years | 3 years |  |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  | $ 64.38 |  | $ 66.48 | $ 23.74 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number |  | 79,911 |  | 113,727 | 79,833 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period |  | 21,630 |  | 125,651 | 101,966 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value |  | $ 1,603,000 |  | $ 11,279,000 | $ 1,315,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  | $ 3,141,000 |  | $ 3,744,000 | $ 1,364,000 |  |
Stock Repurchased During Period, Shares (in shares) |  | 12,862 |  | 13,292 | 11,754 |  |
Shares Acquired, Average Cost Per Share |  | $ 62.2 |  | $ 105.78 | $ 39.32 |  |
Payment, Tax Withholding, Share-Based Payment Arrangement |  | $ 1,220,000 |  | $ 1,406,000 | $ 462,000 |  |
Minimum [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  |  | 3 years |  |
Share-Based Payment Arrangement, Option [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  | 3 years |  |  |  |  |
Share-Based Payment Arrangement, Option [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  | 6 years |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  | 5 years |  |  |  |  |
Cashless Method Stock Option Exercised [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period |  | 21,630 |  | 125,651 | 101,966 |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Granted, unvested shares (in shares) |  | 41,492 |  | 29,512 | 39,807 |  |
Bonus Stock Award [Member] | Share-Based Payment Arrangement, Employee [Member] |  |  |  |  |  |  |
Granted, unvested shares (in shares) |  | 9,144 |  | 0 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share |  | $ 104.36 |  |  |  |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  | $ 3,407,000 |  | $ 2,213,000 | $ 1,223,000 |  |
Cost of Sales [Member] |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  | $ 171,000 |  | $ 126,000 | $ 57,000 |  |
The 2022 Plan [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized |  |  |  |  |  |  | 1,461,461
Stock Compensation Plan 2007 [Member] | Restricted Stock [Member] | Minimum [Member] | Employees [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  | 1 year |  |  |  |  |
Stock Compensation Plan 2007 [Member] | Restricted Stock [Member] | Maximum [Member] | Employees [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  | 10 years |  |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Market Price Percentage, Offering Date |  | 85.00% |  |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  |  | 7,754 |  |  | 5,585 |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price |  |  | $ 40.25 |  |  | $ 53.52 |
Payment, Tax Withholding, Share-Based Payment Arrangement |  | $ 154,000 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized | 200,000 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant |  |  | 168,251 |  |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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