Note 6 - Share-based Compensation - Shared-based Compensation Expense and the Related Tax Benefit (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based compensation expense		$ (35)	$ 377	$ 997	$ 1,867
Related income tax benefit		67	44	192	229
Stock Options and SARs [Member]
Share-based compensation expense		108	16	286	960
Restricted Stock [Member]
Share-based compensation expense		215	140	612	404
Performance Shares [Member]
Share-based compensation expense	[1]	$ (358)	$ 221	$ 99	$ 503

[1] During the three and nine months ended September 30, 2019, the Company reversed $0.5 million of previously recognized expense for certain performance awards after determining that the performance conditions will not be met.