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Note 7 - Stock-based Compensation (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Feb. 23, 2023
Share-Based Payment Arrangement, Expense | $ 1,059,000 | $ 638,000 |  |  |  | $ 2,504,000 | $ 1,647,000 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | 5,385,000 |  | $ 5,385,000 |  |  | $ 5,385,000 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  |  | 2 years 10 months 24 days |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  | 40,266 | 62,730 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  |  |  |  | 5 years |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 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 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  |  |  |  |  | 2 years 6 months 10 days |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value | 2,193,000 |  | $ 2,193,000 |  |  | $ 2,193,000 |  |
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, Award Vesting Period (Year) |  |  |  |  |  | 5 years |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  | 41,492 |  |
Bonus Stock Award [Member] | Share-Based Payment Arrangement, Employee [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  | 9,144 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share (in dollars per share) |  |  |  |  |  | $ 104.36 |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense | 1,016,000 | 606,000 |  |  |  | $ 2,377,000 | $ 1,552,000 |
Cost of Sales [Member] |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense | $ 43,000 | $ 32,000 |  |  |  | $ 126,000 | $ 95,000 |
The 2022 Plan [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  | 1,461,461
The 2022 Plan [Member] | Restricted Stock [Member] | Share-Based Payment Arrangement, Employee [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 3 years |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  | 34,674 | 23,318 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share (in dollars per share) |  |  |  |  |  | $ 72.26 | $ 66.48 |
The 2022 Plan [Member] | Restricted Stock [Member] | Share-Based Payment Arrangement, Nonemployee [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 3 years |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  | 6,818 | 3,118 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share (in dollars per share) |  |  |  |  |  | $ 61.56 | $ 64.11 |
The 2022 Plan [Member] | Restricted Stock [Member] | Share-Based Payment Arrangement, Nonemployee [Member] | Director [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  | 318 |  | 2,758 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share (in dollars per share) |  |  |  |  | $ 62.77 |  | $ 63.35 |
The 2022 Plan [Member] | Restricted Stock [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 1 year |  |
The 2022 Plan [Member] | Restricted Stock [Member] | Maximum [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 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant | 168,251 |  | 168,251 |  |  | 168,251 |  |

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