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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