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Note 14 - Segment Reporting - Segment Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Assets $ 37,912,000 $ 35,524,000
Net Revenue 25,813,000 16,447,000
Operating (loss) income (1,823,000) (4,664,000)
Pretax (loss) income (220,000) [1] 4,775,000
Depreciation and amortization 867,000 742,000
Purchases of property, plant & equipment 665,000 236,000
Corporate, Non-Segment [Member]    
Assets 0 0
Net Revenue 0 0
Operating (loss) income (2,989,000) (3,185,000)
Pretax (loss) income (2,989,000) [1] (3,185,000)
Depreciation and amortization 0 0
Purchases of property, plant & equipment 0 0
Intersegment Eliminations [Member]    
Assets 0 0
Net Revenue (573,000) (346,000)
Operating (loss) income 0 0
Pretax (loss) income 0 [1] 0
Depreciation and amortization 0 0
Purchases of property, plant & equipment 0 0
CVD [Member] | Operating Segments [Member]    
Assets 25,287,000 26,360,000
Net Revenue 16,674,000 8,590,000
Operating (loss) income (1,430,000) (3,454,000)
Pretax (loss) income (156,000) [1] (1,055,000) [2]
Depreciation and amortization 652,000 533,000
Purchases of property, plant & equipment 623,000 106,000
SDC [Member] | Operating Segments [Member]    
Assets 9,679,000 7,409,000
Net Revenue 6,541,000 4,849,000
Operating (loss) income 1,546,000 922,000
Pretax (loss) income 1,849,000 [1] 922,000
Depreciation and amortization 49,000 52,000
Purchases of property, plant & equipment 3,000 31,000
SDC [Member] | Intersegment Eliminations [Member]    
Net Revenue 573,000 346,000
Materials [Member] | Operating Segments [Member]    
Assets 2,946,000 1,755,000
Net Revenue 3,171,000 3,354,000
Operating (loss) income 1,050,000 1,053,000
Pretax (loss) income 1,076,000 [1] 8,093,000 [3]
Depreciation and amortization 166,000 157,000
Purchases of property, plant & equipment $ 39,000 $ 99,000
[1] Includes other income related to ERCs of $1,103, $303 and $123 for the CVD, SDC and Materials segments, respectively.
[2] Includes $2,443 from the gain on debt extinguishment related to the forgiveness of the PPP loan.
[3] Includes $6,894 from the gain on the sale of building.