Note 16 - Segment Reporting - Segment Reporting (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Revenue from Contract with Customer, Including Assessed Tax		$ 143,136	$ 203,477
Direct materials		70,062	105,048
Direct labor		17,153	24,077
Indirect labor		17,258	20,666
Variable overhead		6,258	7,472
AMP credits		(8,819)	(13,354)
Salaries and benefits		2,332	2,646
Share-based compensation		859	634
Depreciation and amortization		6,684	6,383
All other expenses (1)	[1]	27,124	38,766
Operating income (loss)		4,225	11,139
Capital expenditures		3,618	6,405
Total assets		128,290	135,156
External Customers [Member]
Revenue from Contract with Customer, Including Assessed Tax		143,136	203,477
Operating Segments [Member] | Heavy Fabrications [Member]
Revenue from Contract with Customer, Including Assessed Tax		82,657	133,368
Direct materials		46,398	76,769
Direct labor		11,356	17,084
Indirect labor		10,575	13,202
AMP credits		(8,819)	(13,354)
Depreciation and amortization		3,938	3,517
All other expenses (1)	[1]	12,081	21,144
Operating income (loss)		7,128	15,006
Capital expenditures		1,617	4,739
Total assets		43,035	46,931
Operating Segments [Member] | Heavy Fabrications [Member] | External Customers [Member]
Revenue from Contract with Customer, Including Assessed Tax		82,657	133,368
Operating Segments [Member] | Gearing [Member]
Revenue from Contract with Customer, Including Assessed Tax		35,588	45,408
Direct materials		8,797	13,819
Direct labor		5,797	6,993
Indirect labor		4,972	6,085
Variable overhead		4,397	5,499
AMP credits		0	0
Depreciation and amortization		2,183	2,270
All other expenses (1)	[1]	9,580	8,896
Operating income (loss)		(138)	1,846
Capital expenditures		1,554	1,398
Total assets		41,406	48,599
Operating Segments [Member] | Gearing [Member] | External Customers [Member]
Revenue from Contract with Customer, Including Assessed Tax		35,588	45,408
Operating Segments [Member] | Industrial Solutions [Member]
Revenue from Contract with Customer, Including Assessed Tax		26,056	25,159
Direct materials		14,867	14,460
Indirect labor		1,711	1,379
Variable overhead		1,861	1,973
AMP credits		0	0
Depreciation and amortization		427	380
All other expenses (1)	[1]	3,925	3,807
Operating income (loss)		3,265	3,160
Capital expenditures		397	214
Total assets		14,864	16,295
Operating Segments [Member] | Industrial Solutions [Member] | External Customers [Member]
Revenue from Contract with Customer, Including Assessed Tax		24,891	24,701
Operating Segments [Member] | Corporate Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0
Direct materials		0	0
Direct labor		0	0
Indirect labor		0	0
Variable overhead		0	0
AMP credits		0	0
Salaries and benefits		2,332	2,646
Share-based compensation		859	634
Depreciation and amortization		136	216
All other expenses (1)	[1]	2,703	5,388
Operating income (loss)		(6,030)	(8,884)
Capital expenditures		50	54
Total assets		48,488	58,487
Operating Segments [Member] | Corporate Segment [Member] | External Customers [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0
Consolidation, Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax		(1,165)	(458)
Direct labor		0	0
Indirect labor		0	0
Variable overhead		0	0
AMP credits		0	0
Salaries and benefits		0	0
Share-based compensation		0	0
Depreciation and amortization		0	0
All other expenses (1)	[1]	(1,165)	(469)
Operating income (loss)		0	11
Capital expenditures		0	0
Total assets		(19,503)	(35,156)
Consolidation, Eliminations [Member] | External Customers [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0
Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax		(1,165)	(458)
Intersegment Eliminations [Member] | Heavy Fabrications [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0
Intersegment Eliminations [Member] | Gearing [Member]
Revenue from Contract with Customer, Including Assessed Tax		0	0
Intersegment Eliminations [Member] | Industrial Solutions [Member]
Revenue from Contract with Customer, Including Assessed Tax		1,165	458
Intersegment Eliminations [Member] | Corporate Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax		$ 0	$ 0

[1] All other expenses for each reportable segment primarily consist of: Heavy Fabrications-variable overhead, salaries and benefits, and rent and utilities Gearing- salaries and benefits and rent and utilities Industrial Solutions-direct labor, salaries and benefits, and rent and utilities Corporate-professional expenses