Note 12 - Segment Reporting - Segment Information (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021		Sep. 30, 2022	Sep. 30, 2021		Dec. 31, 2021
Assets	$ 33,601,728	$ 35,958,000		$ 33,601,728	$ 35,958,000		$ 35,524,229
Revenue from Contract with Customer, Including Assessed Tax	8,118,627	4,329,459		18,579,447	11,729,727
Operating (loss) income	122,275	(922,324)		(1,601,848)	(3,624,035)
Pretax (loss) income	63,603	6,000,731		(1,772,314)	5,966,670
Segment Reconciling Items [Member]
Assets	42,000	2,000		42,000	2,000
Revenue from Contract with Customer, Including Assessed Tax	(71,000)	(7,000)
Operating (loss) income	(659,000)	(727,000)
Pretax (loss) income	(615,000)	(727,000)
Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax				(497,000)	(122,000)
Operating (loss) income				(1,970,000)	(2,425,000)
Pretax (loss) income				(1,903,000)	(2,425,000)
CVD [Member] | Operating Segments [Member]
Assets	22,415,000	27,248,000		22,415,000	27,248,000
Revenue from Contract with Customer, Including Assessed Tax	5,718,000	2,074,000		12,324,000	5,884,000
Operating (loss) income	(32,000)	(911,000)		(1,391,000)	(2,664,000)
Pretax (loss) income	(27,000)	(920,000)		(1,380,000)	(259,000)	[1]
SDC [Member] | Operating Segments [Member]
Assets	8,800,000	7,053,000		8,800,000	7,053,000
Revenue from Contract with Customer, Including Assessed Tax	1,663,000	1,326,000		4,669,000	3,314,000
Operating (loss) income	448,000	275,000		1,117,000	637,000
Pretax (loss) income	448,000	275,000		1,117,000	637,000
SDC [Member] | Intersegment Eliminations [Member]
Revenue from Contract with Customer, Including Assessed Tax	72,409	6,882		497,306	121,920
Materials [Member] | Operating Segments [Member]
Assets	2,345,000	1,655,000		2,345,000	1,655,000
Revenue from Contract with Customer, Including Assessed Tax	809,000	937,000		2,083,000	2,654,000
Operating (loss) income	365,000	441,000		642,000	828,000
Pretax (loss) income	$ 258,000	$ 7,373,000	[2]	$ 392,000	$ 8,014,000	[2]

[1] CVD segment includes a gain on the forgiveness of the PPP loan for the nine months ended September 30, 2021.

[2] Materials segment includes a gain on the sale of building in the amount of $6,894,109 for the nine months ended September 30, 2021.