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Schedule of Segments (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]    
Assets $ 35,025,000 $ 37,912,000
Revenue 24,109,000 25,813,000
Operating (loss) income (4,881,000) [1] (1,823,000)
Pretax (loss) income (4,194,000) [1] (220,000) [2]
Depreciation and amortization 792,000 867,000
Purchases of property, plant & equipment 418,000 [3]
Operating Segments [Member] | CVD Equipment [Member]    
Segment Reporting Information [Line Items]    
Assets 31,401,000 31,622,000
Revenue 16,334,000 16,674,000
Operating (loss) income (2,129,000) [1] (1,430,000)
Pretax (loss) income (2,070,000) [1] (156,000) [2]
Depreciation and amortization 620,000 652,000
Purchases of property, plant & equipment 404,000 653,000 [3]
Operating Segments [Member] | SDC [Member]    
Segment Reporting Information [Line Items]    
Assets 3,468,000 4,149,000
Revenue 7,139,000 6,541,000
Operating (loss) income 1,677,000 [1] 1,546,000
Pretax (loss) income 1,677,000 [1] 1,849,000 [2]
Depreciation and amortization 49,000 49,000
Purchases of property, plant & equipment 14,000 3,000 [3]
Operating Segments [Member] | CVD Materials [Member]    
Segment Reporting Information [Line Items]    
Assets 211,000 2,099,000
Revenue 1,184,000 3,171,000
Operating (loss) income (193,000) [1] 1,050,000
Pretax (loss) income (141,000) [1] 1,076,000 [2]
Depreciation and amortization 123,000 166,000
Purchases of property, plant & equipment 3,000 [3]
Corporate, Non-Segment [Member]    
Segment Reporting Information [Line Items]    
Assets
Revenue
Operating (loss) income (4,118,000) [1] (2,989,000)
Pretax (loss) income (3,542,000) [1] (2,989,000) [2]
Depreciation and amortization
Purchases of property, plant & equipment [3]
Intersegment Eliminations [Member]    
Segment Reporting Information [Line Items]    
Assets (55,000) 42,000
Revenue (548,000) (573,000)
Operating (loss) income (118,000) [1]
Pretax (loss) income (118,000) [1] [2]
Depreciation and amortization
Purchases of property, plant & equipment [3]
Intersegment Eliminations [Member] | CVD Equipment [Member]    
Segment Reporting Information [Line Items]    
Revenue 109,000 0
Intersegment Eliminations [Member] | SDC [Member]    
Segment Reporting Information [Line Items]    
Revenue $ 439,000 $ 573,000
[1] CVD Materials segment includes loss on sale of Tantaline of $0.2 million and an impairment charge related to MesoScribe fixed assets of $0.1 million.
[2] Includes other income related to ERCs of $1,103, $303 and $123 for the CVD, SDC and Materials segments, respectively.
[3] Include $0.4 million of purchased equipment financed with a loan