Note 11 - Equity-based Compensation - Stock Option Exercises (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Proceeds from issuance of common stock upon stock option exercises		$ 956	$ 0	$ 823
Total intrinsic value of stock option exercises (1)	[1]	129	0	370
Tax expense (benefit) of stock option exercises recorded in income tax expense		312	(1,556)	(63)
Aggregate intrinsic value of outstanding stock options		0	0	386
Aggregate intrinsic value of exercisable stock options		$ 0	$ 0	$ 386

[1] Calculations based on a weighted average market price of the Company's stock at the time of exercise of $20.55 and $27.35 for the years ended December 31, 2019 and 2017, respectively.