Note 3 - Discontinued Operations - Discontinued Operations (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Gain on sale of discontinued operations				$ (6,234)	$ 0
Net income from discontinued operations		$ 19,521	$ 29,602	25,617	26,680
WMS Inliner [Member]
Revenue		85,554	129,501	188,516	233,082
Cost of revenue		70,386	110,787	159,113	204,762
Gross profit		15,168	18,714	29,403	28,320
Selling, general and administrative expenses		6,960	15,440	18,580	30,008
Other costs		(3,565)	85	(2,223)	1,611
Gain on sale of discontinued operations		0	0	(6,234)	0
Gain on sales of property and equipment, net (1), (2)	[1],[2]	(8,530)	(30,583)	(8,796)	(30,893)
Operating income		20,303	33,772	28,076	27,594
Other income, net		(4,426)	(3,739)	(6,034)	(6,297)
Income from discontinued operations before income taxes		24,729	37,511	34,110	33,891
Provision for income taxes		5,208	7,909	8,493	7,211
Net income from discontinued operations		$ 19,521	$ 29,602	$ 25,617	$ 26,680

[1] In June 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.

[2] In June 2022, we completed a sale-leaseback transaction on a property in Arizona. The sale of this property resulted in a reduction in net property and equipment of $3.8 million and a $1.1 million addition to both right of use assets and lease liabilities on the held-for-sale balance sheets, as well as an $8.2 million gain on sales of property and equipment on the discontinued operations statements of operations