CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 201	$ 328
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Stock-based compensation expense	0	3
Depreciation and amortization	71	77
Realized gain on available-for sale securities	0	(5)
Provision for doubtful trade accounts receivable	21	3
Imputed interest expense (benefit) on notes payable	(168)	101
Changes in net assets and liabilities:
Trade accounts receivable	563	1,467
Inventories	272	672
Prepaid and other assets	109	(104)
Trade accounts payable	(632)	(1,178)
Accrued expenses and other	(528)	(177)
Net cash provided by (used in) operating activities	(91)	1,187
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(219)	(163)
Net cash used in investing activities	(219)	(163)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of notes payable	(201)	(168)
Proceeds from employee stock purchase plan	0	20
Net cash used in financing activities	(201)	(148)
Net increase (decrease) in cash and cash equivalents	(511)	876
Cash and cash equivalents, beginning of period	2,162	1,542
Cash and cash equivalents, end of period	$ 1,651	$ 2,418