Note 11 - Segment Reporting - Segment Information (Details) - USD ($)		3 Months Ended			6 Months Ended
		Jun. 30, 2017		Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue		$ 10,829,709		$ 3,743,782	$ 20,480,326	$ 8,747,215
Pretax income		1,830,658		(995,956)	3,538,824	(1,537,410)
Intersegment Eliminations [Member]
Revenue	[1]	(353,613)		(81,023)	(1,316,831)	(94,350)
Pretax income			[1]
CVD [Member] | Operating Segments [Member]
Revenue		9,403,342		3,243,095	17,985,006	7,335,877
Pretax income		1,242,809		(758,035)	2,348,223	(1,363,640)
SDC [Member] | Operating Segments [Member]
Revenue		1,779,980		581,710	3,812,151	1,505,688
Pretax income		$ 587,849		$ (237,921)	$ 1,190,601	$ (173,770)

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