Note 11 - Segment Reporting - Segment Information (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Assets		$ 45,803,383	$ 47,503,913	$ 45,803,383	$ 47,503,913	$ 45,604,692
Revenue		10,831,729	4,883,511	31,312,055	13,630,726
Pretax income		1,904,194	(288,714)	5,443,018	(1,826,124)
Intersegment Eliminations [Member]
Assets	[1]	(1,789,511)	(2,960,808)	(1,789,511)	(2,960,808)	(2,253,550)
Revenue	[1]	(579,609)	(216,729)	(1,896,439)	(311,079)
Pretax income	[1]
CVD [Member] | Operating Segments [Member]
Assets		41,615,403	46,147,895	41,615,403	46,147,895	43,300,131
Revenue		8,862,726	4,253,544	26,847,732	11,589,421
Pretax income		1,055,683	(180,638)	3,403,907	(1,544,278)
SDC [Member] | Operating Segments [Member]
Assets		5,977,491	4,316,826	5,977,491	4,316,826	$ 4,558,111
Revenue		2,548,612	846,696	6,360,762	2,352,384
Pretax income		$ 848,511	$ (108,076)	$ 2,039,111	$ (281,846)

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