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Note 14 - Equity Incentive Plan (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 16, 2020 | Jun. 18, 2019 | Jun. 30, 2020 | Mar. 31, 2020 | Mar. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 13, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  |  | 1,600,000 |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  | $ 5,386 | $ 6,087 | $ 11,046 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) |  |  |  |  |  | $ 41.50 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |  |  |  |  |  | $ 5,500 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  |  |  |  |  | 5 years 4 months 24 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercises in Period, Total Intrinsic Value |  |  |  |  |  | $ 2,800 | $ 8,500 | 8,500 |
Shares Issued, Share, Share-based Payment Arrangement Non-Option Equity Instruments, Exercised (in shares) |  |  |  |  |  |  | 31,541 |  |
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Appreciation Rights Vested in Period Fair Value |  |  |  |  |  | $ 2,500 | $ 2,700 | $ 6,700 |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year) |  |  |  |  |  | 4 years | 3 years 6 months |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  |  |  | $ 16.31 | $ 14.73 | $ 20.01 |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  |  |  |  | $ 200 | $ 100 | $ 1,500 |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  | 3,954 | $ 5,251 | 10,355 |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  |  | $ 1,800 |  |  |  |  |
Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  | $ 6,200 |  |  |  |
Total Shareholder Return ("TSRs") Options [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 2 years 8 months 12 days |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  | $ 600 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year) |  |  |  |  |  | 6 years 3 months 18 days |  |  |
Total Shareholder Return ("TSRs") Options [Member] | President and Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares) |  |  | 104,638 |  |  |  |  |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | $ 8,400 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  | 2 years 1 month 6 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year) |  |  |  |  |  | 4 years |  |  |
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised (in shares) |  |  |  |  |  | 0 | 35,250 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares) |  |  |  |  |  |  | 0 |  |
RSAs, RSUs, and PSUs [Member] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | $ 6,600 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  | 2 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  |  |  | $ 2,300 | $ 1,400 | $ 6,800 |
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) |  |  |  |  |  | $ 37.66 | $ 33.64 | $ 58.84 |
Performance Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  | $ 100 | $ 1,200 | $ 700 |
Share-based Compensation, Performance Shares Measured by Business Targets |  |  |  |  |  | 40.00% | 30.00% |  |
Share-based Compensation, Performance Shares Measured by Financial Targets |  |  |  |  |  | 60.00% | 70.00% |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year) |  |  |  |  |  |  |  | 4 years |
Minimum [Member] | Total Shareholder Return ("TSRs") Options [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Number |  |  | 0.00% |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year) |  |  |  |  |  |  |  | 4 years 6 months |
Maximum [Member] | Total Shareholder Return ("TSRs") Options [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Number |  |  | 150.00% |  |  |  |  |  |
The 2017 Plan [Member] |  |  |  |  |  |  |  |  |
Number of Shares Available for Grant Reduced By Each Share Award Issued Other Than Options or SARs (in shares) |  |  |  |  |  |  |  |  | 2
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  | 2,700,000 |  |  |  |  |  |  | 1,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) |  | 1,500,000 |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance, Number of Shares Increased (in shares) | 800,000 |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | 3,500,000 | 2,700,000 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  |  |  | 10 years |  |  |
The 2017 Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 1 year |  |  |
The 2017 Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 4 years |  |  |

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