Note 13 - Business Segments (Details) - Segment Information (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Trade Revenue	$ 16,649,627	$ 14,189,873	$ 47,537,298	$ 42,325,066
Segment Operating Income (Loss)	2,487,205	1,914,968	5,393,710	4,079,536
Permeation Segment [Member]
Segment Reporting Information [Line Items]
Trade Revenue	5,729,373	5,596,470	16,621,767	15,550,031
Segment Operating Income (Loss)	1,228,580	1,325,605	2,923,453	2,630,193
Package Testing Segment [Member]
Segment Reporting Information [Line Items]
Trade Revenue	7,342,007	6,328,402	21,320,444	18,976,020
Segment Operating Income (Loss)	992,763	674,797	1,701,658	1,183,960
Industrial Analyzers and Other Segment [Member]
Segment Reporting Information [Line Items]
Trade Revenue	3,578,247	2,265,001	9,595,087	7,799,015
Segment Operating Income (Loss)	$ 265,862	$ (85,434)	$ 768,599	$ 265,383