Note 16 - Segment Reporting - Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Revenues from external customers									$ 203,477	$ 176,759
Revenue from Contract with Customer, Including Assessed Tax	$ 46,598	$ 57,163	$ 50,843	$ 48,873	$ 40,060	$ 44,843	$ 50,012	$ 41,844	203,477	176,759
Operating income (loss)	2,274	$ 5,367	$ 2,216	$ 1,282	(2,102)	$ (520)	$ (1,912)	$ (2,073)	11,139	(6,607)
Depreciation and amortization									6,383	6,060
Capital expenditures									6,405	3,098
Total assets	135,156				144,540				135,156	144,540
Operating Segments [Member] | Heavy Fabrications [Member]
Revenues from external customers									133,368	117,194
Revenue from Contract with Customer, Including Assessed Tax									133,368	117,206
Operating income (loss)									15,006	(1,044)
Depreciation and amortization									3,517	3,446
Capital expenditures									4,739	2,601
Total assets	46,931				45,475				46,931	45,475
Operating Segments [Member] | Gearing [Member]
Revenues from external customers									45,408	42,572
Revenue from Contract with Customer, Including Assessed Tax									45,408	42,588
Operating income (loss)									1,846	43
Depreciation and amortization									2,270	1,978
Capital expenditures									1,398	446
Total assets	48,599				51,944				48,599	51,944
Operating Segments [Member] | Industrial Solutions [Member]
Revenues from external customers									24,701	16,993
Revenue from Contract with Customer, Including Assessed Tax									25,159	17,804
Operating income (loss)									3,160	120
Depreciation and amortization									380	397
Capital expenditures									214	48
Total assets	16,295				12,775				16,295	12,775
Operating Segments [Member] | Corporate Segment [Member]
Revenues from external customers									0	0
Revenue from Contract with Customer, Including Assessed Tax									0	0
Operating income (loss)									(8,884)	(5,722)
Depreciation and amortization									216	239
Capital expenditures									54	3
Total assets	58,487				224,856				58,487	224,856
Consolidation, Eliminations [Member]
Revenues from external customers									0	0
Revenue from Contract with Customer, Including Assessed Tax									(458)	(839)
Operating income (loss)									11	(4)
Depreciation and amortization									0	0
Capital expenditures									0	0
Total assets	$ (35,156)				$ (190,510)				(35,156)	(190,510)
Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax									(458)	(839)
Intersegment Eliminations [Member] | Heavy Fabrications [Member]
Revenue from Contract with Customer, Including Assessed Tax									0	12
Intersegment Eliminations [Member] | Gearing [Member]
Revenue from Contract with Customer, Including Assessed Tax									0	16
Intersegment Eliminations [Member] | Industrial Solutions [Member]
Revenue from Contract with Customer, Including Assessed Tax									458	811
Intersegment Eliminations [Member] | Corporate Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax									$ 0	$ 0