Note 15 - Segment Reporting - Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Revenues from external customers	$ 48,873	$ 41,844
Revenue from Contract with Customer, Including Assessed Tax	48,873	41,844
Operating income (loss)	1,282	(2,073)
Depreciation and amortization	1,605	1,519
Capital expenditures	1,065	492
Total assets	148,958		$ 144,540
Consolidation, Eliminations [Member]
Revenues from external customers	0	0
Revenue from Contract with Customer, Including Assessed Tax	(108)	(85)
Operating income (loss)	0	0
Depreciation and amortization	0	0
Capital expenditures	0	0
Total assets	(54,757)		(28,463)
Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	0
Heavy Fabrications [Member]
Operating income (loss)	2,790	(461)
Heavy Fabrications [Member] | Operating Segments [Member]
Revenues from external customers	31,593	27,272
Revenue from Contract with Customer, Including Assessed Tax	31,593	27,272
Depreciation and amortization	858	879
Capital expenditures	662	482
Total assets	57,384		45,475
Heavy Fabrications [Member] | Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	0
Gearing [Member]
Operating income (loss)	581	(112)
Gearing [Member] | Operating Segments [Member]
Revenues from external customers	11,965	10,576
Revenue from Contract with Customer, Including Assessed Tax	11,965	10,584
Depreciation and amortization	596	476
Capital expenditures	385	0
Total assets	53,261		51,944
Gearing [Member] | Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax	0	8
Industrial Solutions [Member]
Operating income (loss)	622	(209)
Industrial Solutions [Member] | Operating Segments [Member]
Revenues from external customers	5,315	3,996
Revenue from Contract with Customer, Including Assessed Tax	5,423	4,073
Depreciation and amortization	94	103
Capital expenditures	18	9
Total assets	14,480		12,775
Industrial Solutions [Member] | Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax	108	77
Corporate Segment [Member]
Operating income (loss)	(2,711)	(1,291)
Corporate Segment [Member] | Operating Segments [Member]
Revenues from external customers	0
Revenue from Contract with Customer, Including Assessed Tax	0	0
Depreciation and amortization	57	61
Capital expenditures	0	1
Total assets	78,590		$ 62,809
Corporate Segment [Member] | Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 0	$ 0