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Note 13 - Stock-based Compensation (Details Textual) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 29, 2014 | Aug. 31, 2020 | Apr. 30, 2020 | Mar. 31, 2020 | Jan. 31, 2020 | May 31, 2019 | Apr. 30, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Jun. 30, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Dec. 31, 2017
Number of Common Stock Accrued Under Share-based Compensation Plan (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
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) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |  |
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, Outstanding, Number, Ending Balance (in shares) |  |  |  |  |  |  |  | 0 |  |  |  |  |  | 0 | 0 | 0 |  | 45,068
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 759,000 | $ 953,000 | $ 719,000 |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 732,000 | 461,000 | 912,000 |  |  |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 | $ 200,000 | $ 172,000 |  |
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.06 | $ 0.12 | $ 0.09 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,077,000 |  |  |  |
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.10 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.34 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,406,000 |  |
Proceeds from Stock Options Exercised |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | $ 0 | $ 485,000 |  |
Director [Member] | Salaries, Wages and Benefits [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 70,000 | $ 90,000 | $ 100,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period (in shares) |  |  |  |  |  |  |  |  |  |  |  | 205 | 276 |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Common Stock Accrued Under Share-based Compensation Plan (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 63,182 |  |  |  |
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) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 36.46 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38.25 |  |  |  |
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) |  |  |  |  |  |  |  |  |  | 242 | 326 |  |  |  |  |  |  |
The 2014 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | 750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  |  |  |  |  |  |  | 362,000 |  |  |  |
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Key Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Common Stock Accrued Under Share-based Compensation Plan (in shares) |  | 13,332 |  |  | 7,000 |  |  | 33,000 |  |  |  |  |  |  |  |  |  |
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) |  | $ 30.25 |  |  | $ 56.45 |  |  | $ 36.35 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  | 4 years |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Common Stock Accrued Under Share-based Compensation Plan (in shares) |  |  | 242 | 2,608 |  | 213 | 1,845 |  | 1,932 |  |  |  |  |  |  |  |  |
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) |  |  | $ 41.40 | $ 30.75 |  | $ 47.06 | $ 48.94 |  | $ 36.35 |  |  |  |  |  |  |  |  |
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Common Stock Accrued Under Share-based Compensation Plan (in shares) |  | 40,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  | $ 35.37 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Chief Executive Officer [Member] | Vesting In 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Number of Shares |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Chief Executive Officer [Member] | Vesting In 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Number of Shares |  | 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Chief Executive Officer [Member] | Vesting In 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Number of Shares |  | 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Chief Executive Officer [Member] | Vesting In 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Number of Shares |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Chief Executive Officer [Member] | Vesting In 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Number of Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000 |
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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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