Schedule of Segments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Assets	$ 35,443,000	$ 34,784,000	$ 35,025,000
Revenue	4,922,000	8,695,000
Operating (loss) income	(1,623,000)	(187,000)
Pretax (loss) income	(1,472,000)	(38,000)
Depreciation and amortization	153,000	166,000
Purchase of property, plant & equipment	76,000	146,000
Operating Segments [Member] | CVD Equipment [Member]
Segment Reporting Information [Line Items]
Assets	31,412,000	28,509,000
Revenue	2,947,000	5,845,000
Operating (loss) income	(1,405,000)	(95,000)
Pretax (loss) income	(1,411,000)	(93,000)
Depreciation and amortization	141,000	131,000
Purchase of property, plant & equipment	76,000	136,000
Operating Segments [Member] | SDC [Member]
Segment Reporting Information [Line Items]
Assets	3,882,000	4,467,000
Revenue	1,931,000	2,312,000
Operating (loss) income	632,000	631,000
Pretax (loss) income	632,000	631,000
Depreciation and amortization	12,000	12,000
Purchase of property, plant & equipment		10,000
Operating Segments [Member] | CVD Materials [Member]
Segment Reporting Information [Line Items]
Assets	183,000	1,783,000
Revenue	59,000	667,000
Operating (loss) income	(25,000)	81,000
Pretax (loss) income	(25,000)	108,000
Depreciation and amortization		23,000
Purchase of property, plant & equipment
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Assets	(34,000)	25,000
Revenue	(15,000)	(129,000)
Operating (loss) income
Pretax (loss) income
Depreciation and amortization
Purchase of property, plant & equipment
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Segment Reporting Information [Line Items]
Assets
Revenue
Operating (loss) income	(825,000)	(804,000)
Pretax (loss) income	(668,000)	(684,000)
Depreciation and amortization
Purchase of property, plant & equipment