Quarterly Financial Data (Unaudited) (Details) - USD ($)	2 Months Ended	3 Months Ended												5 Months Ended	8 Months Ended	12 Months Ended
	Jan. 31, 2015	Jul. 31, 2015	[1]	Apr. 30, 2015	[1]	Jan. 31, 2015	[1]	Oct. 31, 2014	Jul. 31, 2014	[2]	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Apr. 30, 2015	Jul. 31, 2015	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Quarterly Financial Data (Unaudited) [Abstract]
Net sales		$ 20,809,000		$ 19,375,000		$ 18,189,000		$ 16,646,000	$ 18,008,000		$ 16,135,000	$ 15,096,000	$ 15,530,000
Gross Profit		11,258,000		10,105,000		9,584,000		9,270,000	9,995,000		8,912,000	8,398,000	8,924,000			$ 40,217,000	$ 36,229,000	$ 32,371,000
Operating Income		1,966,000		1,769,000		1,198,000		1,157,000	2,156,000		1,411,000	(377,000)	1,391,000			6,090,000	4,581,000	3,721,000
Net income		$ 1,529,000		$ 1,229,000		$ 952,000		$ 768,000	$ 1,410,000		$ 943,000	$ (225,000)	$ 935,000			$ 4,478,000	$ 3,063,000	$ 2,559,000
Earnings per share - basic (in dollars per share)		$ 0.06		$ 0.05		$ 0.04		$ 0.03	$ 0.06		$ 0.04	$ (0.01)	$ 0.04			$ 0.18	$ 0.12	$ 0.10
Earnings per share - diluted (in dollars per share)		$ 0.06		$ 0.05		$ 0.04		$ 0.03	$ 0.06		$ 0.04	$ (0.01)	$ 0.04			$ 0.18	$ 0.12	$ 0.10
Basic weighted average common shares outstanding (in share)		25,372,653		25,371,764		25,364,574		25,339,983	25,352,326		25,331,925	25,309,641	25,294,020			25,362,166	25,323,622	25,243,010
Diluted weighted average common shares outstanding (in share)		25,505,648		25,476,336		25,424,835		25,390,181	25,400,341		25,392,782	25,309,641	25,389,940			25,449,027	25,393,264	25,337,525
Sterimedix [Member]
Quarterly Financial Data (Unaudited) [Abstract]
Net sales															$ 5,700,000
Net income															851,000
Business Acquisition [Line Items]
Net sales	$ 1,066,000													$ 2,266,000	2,342,000
Net income	$ 14,000													$ 320,000	$ 517,000

[1] The results of Sterimedix are reflected in our results of operations since December 10, 2014, the date of acquisition and reflect the following: Net sales $ 2,342 $ 2,266 $ 1,066 Net income $ 517 $ 320 $ 14

[2] The results of the private OEM Company have been reflected in our results of operations since May 3, 2014, the date of the acquisition.