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Note 12 - Segment Reporting - Segment Information (Details) - USD ($)		3 Months Ended				9 Months Ended
		Sep. 30, 2018		Sep. 30, 2017		Sep. 30, 2018		Sep. 30, 2017	Dec. 31, 2017
Assets		$ 55,410,066		$ 45,803,000		$ 55,410,066		$ 45,803,000	$ 58,978,250
Revenue		4,027,768		10,831,729		19,616,879		31,312,055
Operating (loss)/income		(2,853,470)		1,890,323	[1]	(3,322,515)		5,437,899
Pretax (loss)/income		(2,927,442)		1,904,194		(3,590,846)		5,443,018
Corporate, Non-Segment [Member]
Assets		1,925,000		1,952,000		1,925,000		1,952,000
Revenue								(1,896,000)
Operating (loss)/income		(801,000)		(550,000)	[1]	(2,140,000)		(1,551,000)
Pretax (loss)/income		(760,000)		(550,000)		(2,053,000)		(1,545,000)
Intersegment Eliminations [Member]
Assets	[1]	(10,024,000)		(1,789,000)		(10,024,000)		(1,789,000)
Revenue	[1]	(87,000)		(580,000)		(673,000)
Operating (loss)/income	[1]
Pretax (loss)/income			[1]		[1]		[1]
CVD [Member] | Operating Segments [Member]
Assets		39,792,000		39,663,000		39,792,000		39,663,000
Revenue		2,542,000		8,863,000		14,883,000		26,848,000
Operating (loss)/income		(1,835,000)		1,606,000	[1]	(212,000)		4,604,000
Pretax (loss)/income		(1,850,000)		1,606,000		(266,000)		4,604,000
SDC [Member] | Operating Segments [Member]
Assets		6,288,000		5,977,000		6,288,000		5,977,000
Revenue		1,047,000		2,549,000		4,151,000		6,361,000
Operating (loss)/income		125,000		848,000	[1]	535,000		2,384,000
Pretax (loss)/income		125,000		848,000		535,000		2,384,000
Materials [Member] | Operating Segments [Member]
Assets		17,429,000				17,429,000
Revenue		526,000				1,256,000
Operating (loss)/income		(343,000)			[1]	(1,505,000)
Pretax (loss)/income		$ (442,000)				$ (1,806,000)
[1] All elimination entries represent intersegment transactions eliminated in consolidation for external financial reporting.

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