Note 3 - Discontinued Operations - Discontinued Operations (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Gain on sale of discontinued operations		$ (6,234)	$ 0
Net income (loss) from discontinued operations		6,096	(2,922)
WMS Inliner [Member]
Revenue		102,961	103,581
Cost of revenue		88,727	93,975
Gross profit		14,234	9,606
Selling, general and administrative expenses		11,618	14,568
Other costs		1,343	1,526
Gain on sale of discontinued operations		(6,234)	0
Gain on sales of property and equipment, net	[1]	(266)	(310)
Operating income (loss)		7,773	(6,178)
Other income, net		(1,608)	(2,558)
Income (loss) from discontinued operations before provision for (benefit from) income taxes		9,381	(3,620)
Provision for (benefit from) income taxes		3,285	(698)
Net income (loss) from discontinued operations		$ 6,096	$ (2,922)

[1] During 2021, we completed a sale-leaseback transaction for two properties in California. The sale of these properties resulted in a reduction in net property and equipment of $11.1 million and a $2.4 million addition to both right of use assets and lease liabilities on the held-for-sale balance sheets, as well as a $29.7 million gain on sales of property and equipment on the discontinued operations statements of operations.