OPERATING SEGMENTS Financial Information by Geographic Region (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Financial Information by Geographic Region
Sales to unaffiliated customers	$ 66,045	$ 67,417	$ 69,305	$ 63,546	$ 63,892	$ 64,152	$ 61,122	$ 61,417	$ 266,313	$ 250,583	$ 240,681
Income (Loss) before income taxes									11,337	17,499	8,361
Net Income (Loss)	466	722	4,281	2,887	4,737	3,251	2,146	4,452	8,356	14,586	6,098
Identifiable assets	186,204				183,559				186,204	183,559	174,267
Foreign subsidiaries
Financial Information by Geographic Region
Sales to unaffiliated customers									11,246	11,928	11,299
Income (Loss) before income taxes									(872)	(245)	(1,021)
Net Income (Loss)									(708)	(176)	(876)
Identifiable assets	8,143				8,298				8,143	8,298	8,702
Domestic Operations
Financial Information by Geographic Region
Sales to unaffiliated customers									255,067	238,655	229,382
Sales or transfers between geographic areas									4,285	4,624	4,440
Income (Loss) before income taxes									12,209	17,744	9,382
Net Income (Loss)									9,064	14,762	6,974
Identifiable assets	$ 178,061				$ 175,261				$ 178,061	$ 175,261	$ 165,565