Note 13 - Business Segments (Details) - Segment Information (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Trade Revenue	$ 15,574,523	$ 13,688,015	$ 30,887,671	$ 28,135,193
Segment Operating Income (Loss)	1,785,874	909,220	2,906,505	2,164,568
Permeation Segment [Member]
Segment Reporting Information [Line Items]
Trade Revenue	5,043,897	5,150,886	10,892,396	10,116,828
Segment Operating Income (Loss)	661,134	863,123	1,674,731	1,352,966
Package Testing Segment [Member]
Segment Reporting Information [Line Items]
Trade Revenue	7,353,969	6,035,986	13,978,436	12,647,618
Segment Operating Income (Loss)	678,486	(20,688)	729,038	509,164
Industrial Analyzers and Other Segment [Member]
Segment Reporting Information [Line Items]
Trade Revenue	3,176,657	2,501,143	6,016,839	5,370,747
Segment Operating Income (Loss)	$ 446,254	$ 66,785	$ 502,736	$ 302,438