Condensed Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	May 31, 2012	May 31, 2011	May 31, 2012	May 31, 2011
Distribution sales	$ 30,019	$ 26,475	$ 83,283	$ 76,513
Cost of goods sold	21,417	19,273	60,197	55,850
Gross profit from distribution operations	8,602	7,202	23,086	20,663
Rental revenue	314	310	937	933
Cost of rental operations	188	101	481	443
Gross profit from rental operations	126	209	456	490
Operating expenses:
Selling, general and administrative expenses	6,826	6,032	20,150	18,168
Total operating expenses	6,826	6,032	20,150	18,168
Income from operations	1,902	1,379	3,392	2,985
Non-operating income (expense):
(Loss) gain on sale of trading securities	(17)	69	45	322
Unrealized gain (loss) on trading securities	68	(120)	353	20
Interest expense, net	(185)	(188)	(544)	(575)
Total non-operating expense	(134)	(239)	(146)	(233)
Net income before income taxes	1,768	1,140	3,246	2,752
Provision for income taxes	811	519	1,261	998
Net income	957	621	1,985	1,754
Cumulative preferred stock dividend	(19)	(19)	(57)	(57)
Net income attributable to common shareholders	$ 938	$ 602	$ 1,928	$ 1,697
Basic and diluted earnings per share (in dollars per share)	$ 0.19	$ 0.12	$ 0.40	$ 0.35
Basic and diluted weighted average common shares outstanding (in shares)	4,861,590	4,861,590	4,861,590	4,861,590