Note 12 - Share-based Compensation - Shared-based Compensation Expense and the Related Tax Benefit (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based compensation expense		$ 1,485	$ 2,264	$ 1,664
Related income tax benefit		262	282	229
Stock Options and SARs [Member]
Share-based compensation expense		407	984	1,093
Restricted Stock [Member]
Share-based compensation expense		835	551	331
Performance Shares [Member]
Share-based compensation expense	[1]	$ 243	$ 729	$ 240

[1] During the year ended December 31, 2019, the Company reversed $0.5 million of previously recognized expense for certain performance awards after determining that the performance conditions are not expected to be met.