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Note 7 - Stock-based Compensation (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Share-Based Payment Arrangement, Expense | $ 1,152,000 | $ 1,059,000 |  |  | $ 3,437,000 | $ 2,504,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | 6,213,000 |  | $ 6,213,000 |  | $ 6,213,000 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  | 2 years 4 months 24 days |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross |  |  |  |  | 118,706 | 40,266
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period |  |  |  |  | 3 years |
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  |  |  |  | $ 26.84 | $ 64.38
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  |  |  |  | 1 year 9 months 3 days |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value | $ 2,473,000 |  | $ 2,473,000 |  | $ 2,473,000 |
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 |  |  | 13,598 | 10,104 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price |  |  | $ 24.72 | $ 24.72 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant | 144,548 |  | 144,548 |  | 144,548 |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period |  |  |  |  | 5 years | 5 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period |  |  |  |  | 3 years | 3 years
Share-Based Payment Arrangement, Option [Member] | Minimum [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period |  |  |  |  | 3 years |
Share-Based Payment Arrangement, Option [Member] | Maximum [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period |  |  |  |  | 5 years |
Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Nonemployee [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period |  |  |  |  |  | 1 year
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  | 6,818
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share |  |  |  |  |  | $ 61.56
Restricted Stock Units (RSUs) [Member] | The 2022 Plan [Member] | Share-Based Payment Arrangement, Employee [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period |  |  |  |  | 3 years | 3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  | 137,928 | 34,674
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share |  |  |  |  | $ 26.65 | $ 72.26
Performance Stock Units [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  | $ 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  | 47,745 | 0
Granted, weighted average grant date fair value (in dollars per share) |  |  |  |  | $ 26.18 |
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 |  |  |  |  | 0 | 9,144
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 | $ 1,099,000 | 1,016,000 |  |  | $ 3,280,000 | $ 2,377,000
Cost of Sales [Member] |  |  |  |  |  |
Share-Based Payment Arrangement, Expense | $ 53,000 | $ 43,000 |  |  | $ 157,000 | $ 126,000

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Per share or unit weighted-average intrinsic value of award granted under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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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 Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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