Note 3 - Discontinued Operations - Assets and Liabilities Held-for-sale (Details) - WMS Inliner [Member] - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Cash and cash equivalents	$ 7,544	$ 16,496	$ 12,095
Receivables, net	54,652	102,208	81,877
Contract assets	16,700	41,340	40,440
Inventories	11,954	19,625	20,635
Other current assets	1,270	1,781	4,347
Property and equipment, net	40,490	70,912	101,220
Investments in affiliates	50,453	48,675	47,399
Goodwill	19,982	63,063	63,092
Right of use assets	4,839	12,365	8,362
Other noncurrent assets	3,890	16,176	24,857
Total assets classified as held-for-sale	211,774	392,641	404,324
Accounts payable	16,682	37,997	37,337
Contract liabilities	3,447	7,129	6,516
Other current liabilities	15,808	27,764	24,625
Long-term lease liabilities	2,641	8,352	6,167
Other long-term liabilities	1,668	2,166	4,558
Total liabilities classified as held-for-sale	$ 40,246	$ 83,408	$ 79,203