CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 229	$ 432
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Stock-based compensation expense		3
Depreciation and amortization	43	48
Realized gain on available-for sale securities		(5)
Provision for doubtful trade accounts receivable	23	11
Imputed interest expense (benefit) on notes payable	(281)	81
Changes in net assets and liabilities:
Trade accounts receivable	381	483
Inventories	(449)	273
Prepaid and other assets	82	(62)
Trade accounts payable	149	(614)
Accrued expenses and other	(421)	(140)
Net cash provided by (used in) operating activities	(244)	510
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(160)	(73)
Net cash used in investing activities	(160)	(73)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of note payable	(191)
Proceeds from employee stock purchase plan		9
Net cash provided by (used in) financing activities	(191)	9
Net increase (decrease) in cash and cash equivalents	(595)	446
Cash and cash equivalents, beginning of period	2,162	1,542
Cash and cash equivalents, end of period	$ 1,567	$ 1,988