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Note 13 - Stock-based Compensation (Details Textual) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Aug. 16, 2021 | May 29, 2014 | May 31, 2023 $ / shares shares | Feb. 28, 2023 $ / shares shares | Jun. 30, 2022 $ / shares shares | May 31, 2022 $ / shares shares | Feb. 28, 2022 $ / shares shares | Jun. 30, 2023 shares | Jun. 30, 2022 shares | Mar. 31, 2022 shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value | $ |  |  |  |  |  |  |  |  |  |  | $ 576,000 | $ 392,000 | $ 203,000
Share-Based Payment Arrangement, Expense | $ |  |  |  |  |  |  |  |  |  |  | 553,000 | 715,000 | 441,000
Share-Based Payment Arrangement, Expense, Tax Benefit | $ |  |  |  |  |  |  |  |  |  |  | $ 197,000 | $ 170,000 | $ 110,000
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Diluted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.02 | $ 0.03 | $ 0.03
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.02 | $ 0.02 | $ 0.02
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ |  |  |  |  |  |  |  |  |  |  | $ 2,134,000 |  |
Director [Member] | Salaries, Wages and Benefits [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense | $ |  |  |  |  |  |  |  |  |  |  | $ 55,000 | $ 55,000 | $ 80,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period (in shares) |  |  |  |  |  |  |  | 2,295 | 1,855 |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  |  |  |  |  | 30,608 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 27.97 |  |
Accrual Shares to Each Non-employee Director [Member] | Nine Non-Employee Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period (in shares) |  |  |  |  |  |  |  |  |  | 652 |  |  |
Stock Split To [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 2 |  |  |  |  |  |  |  |  |  |  | 2 |
The 2014 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  |  |  |  |  |  |  | 1,402,000 |  |
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Key Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 28,313 |  |  | 29,120 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares |  |  |  | $ 28.3 |  |  | $ 38.8 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  |  | 4 years | 4 years |  | 4 years |  |  |  |  |  |
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Key Employees [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  | 25.00% |  |  | 25.00% |  |  |  |  |  |
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 2,295 |  |  | 1,855 |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares |  |  | $ 23.95 |  |  | $ 29.6 |  |  |  |  |  |  |
The 2014 Stock Option Plan [Member] | Stock Award [Member] | A Key Employee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  | 3,500 |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares |  |  |  |  | $ 27.68 |  |  |  |  |  |  |  |
The 2014 Stock Option Plan [Member] | Stock Award [Member] | A Key Employee [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  |  | 25.00% |  |  |  |  |  |  |  |
The 2014 Stock Option Plan [Member] | Minimum [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent |  | 85.00% |  |  |  |  |  |  |  |  |  |  |

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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 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 Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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