Note 11 - Segment Reporting - Segment Information (Details) - USD ($)		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Revenue		$ 9,650,617	$ 5,003,433
Pretax (loss)/income		1,708,166	(541,454)
Intersegment Eliminations [Member]
Revenue	[1]	(963,217)	(13,327)
Pretax (loss)/income	[1]
CVD [Member] | Operating Segments [Member]
Revenue		8,581,663	4,092,781
Pretax (loss)/income		1,105,414	(605,605)
SDC [Member] | Operating Segments [Member]
Revenue		2,032,171	923,979
Pretax (loss)/income		$ 602,752	$ 64,151

[1] All elimination entries represent intersegment revenues eliminated in consolidation for external financial reporting.