Note 2 - Income (Loss) Per Share - Calculation of Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended						9 Months Ended
		Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerators:
Income (loss) from continuing operations		$ 16,442			$ 4,713			$ 40,459	$ (21,540)
Income from discontinued operations		0			2,788			2,540	4,485
Net income (loss)		$ 16,442	$ 15,417	$ 11,140	$ 7,501	$ (22,343)	$ (2,213)	$ 42,999	$ (17,055)
Denominator:
Denominator for basic income (loss) per share – weighted-average shares (in shares)		16,782			17,134			16,832	17,435
Effect of dilutive securities:
Diluted weighted average shares outstanding (in shares)		16,975			17,267			17,041	17,435
Basic income (loss) per share:
Income (loss) from continuing operations (in dollars per share)		$ 0.98			$ 0.28			$ 2.40	$ (1.24)
Income from discontinued operations (in dollars per share)		0			0.16			0.15	0.26
Net income (loss) (1) (in dollars per share)	[1]	0.98			0.44			2.55	(0.98)
Diluted income (loss) per share:
Income (loss) per diluted share from continuing operations (in dollars per share)		0.97			0.27			2.37	(1.24)
Income from discontinued operations (in dollars per share)		0			0.16			0.15	0.26
Net income (loss) (1) (in dollars per share)	[1]	$ 0.97			$ 0.43			$ 2.52	$ (0.98)
Restricted Stock [Member]
Effect of dilutive securities:
Equivalent shares issuable upon conversion of unvested shares (in shares)		193			133			209	0
Share-based Payment Arrangement, Option [Member]
Effect of dilutive securities:
Equivalent shares issuable upon conversion of unvested shares (in shares)		0			0			0	0

[1] Sum of the individual amounts may not add due to rounding.