Note 10 - Stock-based Compensation and Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Schedule Of Common Stock Shares Reserved For Issuance And Shares Available For Grant [Table Text Block]

	Year Ended December 31,
	2022		2021		2020
Shares of common stock reserved for issuance under the plans		6,473,228		6,473,228		3,973,228
Shares of common stock available for future grants		2,466,167		3,037,187		1,591,577

Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

	Weighted-average		Time			Weight-average
	Grant-Date		Based			Grant Date		Performance
	Fair Value		Units			Fair Value		Based Units
Non-vested balance at December 31, 2019	$	23.32		403,768		$	25.54		93,814
Granted		5.95		594,234			—		—
Vested		24.05		(265,919	)		26.04		(63,365	)
Non-vested balance at December 31, 2020	$	8.95		732,083		$	24.50		30,449
Granted		13.26		452,403			—		—
Vested		10.97		(406,604	)		—		—
Cancelled/forfeited		24.50		(1,769	)		—		—
Non-vested balance at December 31, 2021	$	10.37		776,113		$	24.50		30,449
Granted		14.46		448,433			12.72		126,724
Vested		10.62		(355,226	)		24.50		(15,225	)
Cancelled/forfeited		12.72		(3,000	)		24.50		(15,224	)
Non-vested balance at December 31, 2022	$	12.33		866,320		$	12.72		126,724

(In Thousands)	Year Ended December 31,
	2022		2021		2020
Grant date fair value of restricted stock units vested	$	3,561	$	4,460	$	6,395
Restricted stock unit compensation expense		6,469		5,638		5,117