Note 1 - Summary of Significant Accounting Policies - Calculation of Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerators:
(Loss) income from continuing operations	$ 11,615	$ 6,052	$ (30,504)	$ (4,087)	$ 258	$ (4,042)	$ 5,245	$ 3,758	$ (14,120)	$ 5,219	$ 40,860
(Loss) income from discontinued operations	(33,082)	2,788	825	871	904	853	826	675	(28,598)	3,258	1,643
Net Income (Loss) Attributable to Parent, Total	$ (25,663)	$ 7,501	$ (22,343)	$ (2,213)	$ 1,162	$ (3,189)	$ 6,071	$ 4,433	$ (42,718)	$ 8,477	$ 42,503
Denominator:
Denominator for basic income per share – weighted-average shares (in shares)									17,358	18,435	18,340
Effect of dilutive securities:
Diluted weighted average shares outstanding (in shares)									17,358	18,635	18,469
Basic (loss) income per share:
Income (loss) from continuing operations (in dollars per share)	$ 0.43	$ 0.28	$ (1.36)	$ (0.17)	$ 0.01	$ (0.22)	$ 0.28	$ 0.20	$ (0.81)	$ 0.28	$ 2.23
(Loss) income from discontinued operations (in dollars per share)	(1.93)	0.16	0.05	0.05	0.05	0.05	0.04	0.04	(1.65)	0.18	0.09
Net (loss) income per basic share (in dollars per share)	(1.50)	0.44	(1.31)	(0.12)	0.06	(0.17)	0.33	0.24	(2.46)	0.46	2.32
Diluted (loss) income per share:
(Loss) income from continuing operations (in dollars per share)	0.43	0.27	(1.36)	(0.17)	0.01	(0.22)	0.28	0.20	(0.81)	0.28	2.21
(Loss) income from discontinued operations (in dollars per share)	(1.93)	0.16	0.05	0.05	0.05	0.05	0.04	0.04	(1.65)	0.17	0.09
Diluted income per share (in dollars per share)	$ (1.50)	$ 0.43	$ (1.31)	$ (0.12)	$ 0.06	$ (0.17)	$ 0.33	$ 0.24	$ (2.46)	$ 0.45	$ 2.30
Restricted Stock [Member]
Effect of dilutive securities:
Equivalent shares issuable upon conversion of unvested restricted shares (in shares)									0	200	129
Share-based Payment Arrangement, Option [Member]
Effect of dilutive securities:
Equivalent shares issuable upon conversion of unvested restricted shares (in shares)									0	0	0