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Note 11 - Segment Reporting - Segment Information (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jul. 01, 2019	Dec. 31, 2018	Jul. 01, 2018
Assets		$ 49,533,754		$ 49,533,754		$ 49,534,000	$ 52,514,562	$ 55,410,000
Revenue		5,704,882	$ 4,027,768	14,100,261	$ 19,616,879
Operating income/(loss)		(248,571)	(2,853,470)	(4,357,007)	(3,322,515)
Pretax income/(loss)		(139,009)	(2,927,442)	(4,399,382)	(3,590,846)
Intersegment Eliminations [Member]
Assets	[1]					(9,000)		(9,000)
Revenue	[1]	(175,000)	(87,000)	(641,000)	(673,000)
Operating income/(loss)	[1]	(597,000)	(801,000)	(2,501,000)	(2,140,000)
Pretax income/(loss)	[1]	(597,000)	(760,000)	(2,501,000)	(2,053,000)
CVD [Member] | Operating Segments [Member]
Assets						36,389,000		31,702,000
Revenue		4,376,000	2,542,000	9,588,000	14,883,000
Operating income/(loss)		231,000	(1,835,000)	(2,328,000)	(212,000)
Pretax income/(loss)		226,000	(1,850,000)	(2,297,000)	(266,000)
SDC [Member] | Operating Segments [Member]
Assets						6,689,000		6,288,000
Revenue		1,100,000	1,047,000	3,778,000	4,151,000
Operating income/(loss)		254,000	125,000	936,000	535,000
Pretax income/(loss)		260,000	125,000	951,000	535,000
Materials [Member] | Operating Segments [Member]
Assets						$ 6,465,000		$ 17,429,000
Revenue		404,000	526,000	1,375,000	1,256,000
Operating income/(loss)		(137,000)	(343,000)	(464,000)	(1,505,000)
Pretax income/(loss)		$ (28,000)	$ (442,000)	$ (552,000)	$ (1,806,000)
[1] All elimination entries represent intersegment revenues eliminated in consolidation for external financial reporting.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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