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Note 10 - Stock-based Compensation and Incentive Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in shares)	0
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Grant Date Fair Value	$ 6,395	$ 19,193	$ 12,513
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)	0
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 4,700	6,300	22,600
Employee Service Sharebased Compensation Nonvested Awards Compensation Cost Not Yet Recognized Net Of Tax	$ 3,700	$ 5,000	$ 17,100
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years
Restricted Stock Units (RSUs) [Member] | Time Based Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	594,234	186,143	455,063
Restricted Stock Units (RSUs) [Member] | Time Based Shares [Member] | During Fiscal 2021 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares)	449,870
Phantom Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	0
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Grant Date Fair Value		$ 1,100	$ 3,000
A2017 Incentive Plan [Member] | Plan Of Reorganization [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
A2017 Incentive Plan [Member] | Plan Of Reorganization [Member] | Restricted Stock Units (RSUs) [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	1 year
Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)	344,598
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 6.48
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)	9 years 3 months 18 days
Stock Option Plan [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 900
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 3 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement net of tax.

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