Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Cash flows from operating activities:
Net income	$ 1,439,000	$ 5,225,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization of property, plant and equipment	1,530,000	1,608,000
Amortization of intangible assets with finite lives	1,376,000	1,561,000
Amortization of stock-based compensation	1,051,000	1,337,000
Deferred financing costs	0	65,000
(Gain) loss on disposal of property, plant and equipment	(1,000)	1,000
Provision for allowance for doubtful accounts	630,000	137,000
Provision for excess and obsolete inventory	696,000	558,000
Excess income tax benefit from stock-based award exercises	(4,000)	(99,000)
Deferred income tax benefit	(1,641,000)	(316,000)
Changes in assets and liabilities:
Accounts receivable	9,275,000	(6,577,000)
Inventories	(1,498,000)	(5,602,000)
Prepaid expenses and other current assets	1,342,000	920,000
Other assets	43,000	(38,000)
Accounts payable	(3,017,000)	(1,102,000)
Accrued expenses and other current liabilities	(4,069,000)	(4,008,000)
Customer advances and deposits	(4,106,000)	(1,406,000)
Other liabilities	119,000	96,000
Income taxes payable	1,908,000	2,930,000
Net cash provided by (used in) operating activities	5,073,000	(4,710,000)
Cash flows from investing activities:
Purchases of property, plant and equipment	(636,000)	(747,000)
Net cash used in investing activities	(636,000)	(747,000)
Cash flows from financing activities:
Cash dividends paid	(4,844,000)	(4,849,000)
Proceeds from issuance of employee stock purchase plan shares	175,000	243,000
Excess income tax benefit from stock-based award exercises	4,000	99,000
Net cash used in financing activities	(4,665,000)	(4,507,000)
Net decrease in cash and cash equivalents	(228,000)	(9,964,000)
Cash and cash equivalents at beginning of period	150,953,000	154,500,000
Cash and cash equivalents at end of period	150,725,000	144,536,000
Cash paid during the period for:
Interest	0	88,000
Income taxes	500,000	200,000
Non-cash investing and financing activities:
Cash dividends declared but unpaid (including accrual of dividend equivalents)	$ 5,154,000	$ 5,030,000