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Note 14 - Segment Reporting (Details Textual)	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Number of Operating Segments	3
Revenue from Contract with Customer, Including Assessed Tax	$ 25,813,000	$ 16,447,000
Employee retention credits	1,529,000	0
Gain (Loss) on Extinguishment of Debt, Total	0	2,443,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	0	6,894,000
SDC [Member]
Employee retention credits	303,000
CVD [Member]
Employee retention credits	1,103,000
Gain (Loss) on Extinguishment of Debt, Total		2,443,000
Materials [Member]
Employee retention credits	123,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		6,894,000
Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax	(573,000)	(346,000)
Intersegment Eliminations [Member] | SDC [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 573,000	$ 346,000

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