Note 3 - Discontinued Operations - Assets and Liabilities Held-for-sale (Details) - WMS Inliner [Member] - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Cash and cash equivalents	$ 8,617	$ 16,496	$ 15,561
Receivables, net	62,626	102,208	103,024
Contract assets	19,148	41,340	39,941
Inventories	12,490	19,625	21,840
Other current assets	1,142	1,781	3,901
Property and equipment, net	38,767	70,912	84,247
Investments in affiliates	53,240	48,675	50,309
Goodwill	19,985	63,063	63,124
Right of use assets	6,032	12,365	12,038
Other noncurrent assets	732	16,176	20,410
Total assets classified as held-for-sale	222,779	392,641	414,395
Accounts payable	18,429	37,997	44,850
Contract liabilities	3,466	7,129	8,435
Other current liabilities	21,737	27,764	26,202
Long-term lease liabilities	3,060	8,352	8,239
Other long-term liabilities	14	2,166	2,337
Total liabilities classified as held-for-sale	$ 46,706	$ 83,408	$ 90,063