Note 11 - Segment Reporting - Segment Information (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Operating Segments [Member] | CVD [Member]
Assets		$ 46,147,895	$ 41,587,898	$ 46,147,895	$ 41,587,898	$ 39,529,971
Revenue		4,253,544	9,373,890	11,589,421	27,921,375
Pretax (loss)		(180,638)	687,094	(1,544,278)	2,322,739
Operating Segments [Member] | SDC [Member]
Assets		4,316,826	3,826,352	4,316,826	3,826,352	3,619,304
Revenue		846,696	1,445,257	2,352,384	4,676,210
Pretax (loss)		(108,076)	167,539	(281,846)	1,219,238
Intersegment Eliminations [Member]
Assets	[1]	(2,960,808)	(2,039,829)	(2,960,808)	(2,039,829)	(2,017,571)
Revenue	[1]	(216,729)	(173,323)	(311,079)	(1,825,164)
Pretax (loss)	[1]
Assets		47,503,913	43,374,421	47,503,913	43,374,421	$ 41,131,704
Revenue		4,883,511	10,645,824	13,630,726	30,772,421
Pretax (loss)		$ (288,714)	$ 854,633	$ (1,826,124)	$ 3,541,977

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