Condensed Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2013	May 31, 2012
Distribution sales	$ 31,124	$ 30,019	$ 88,566	$ 83,283
Cost of goods sold	22,273	21,417	63,719	60,197
Gross profit from distribution operations	8,851	8,602	24,847	23,086
Rental revenue	244	314	582	937
Cost of rental operations	132	188	319	481
Gross profit from rental operations	112	126	263	456
Operating expenses:
Selling, general and administrative expenses	7,708	6,826	22,318	20,150
Total operating expenses	7,708	6,826	22,318	20,150
Income from operations	1,255	1,902	2,792	3,392
Non-operating income (expense):
(Loss) gain on sale of trading securities	64	(17)	(14)	45
Unrealized gain (loss) on trading securities	21	68	(20)	353
Gain on sale of asset	240	0	780	0
Interest expense, net	(158)	(185)	(491)	(544)
Total non-operating income (expense)	167	(134)	255	(146)
Net income before income taxes	1,422	1,768	3,047	3,246
Provision for income taxes	138	811	739	1,261
Net income	1,284	957	2,308	1,985
Cumulative preferred stock dividend	(19)	(19)	(57)	(57)
Net income attributable to common shareholders	$ 1,265	$ 938	$ 2,251	$ 1,928
Basic and diluted earnings per share (in dollars per share)	$ 0.26	$ 0.19	$ 0.46	$ 0.40
Basic and diluted weighted average common shares outstanding (in shares)	4,861,590	4,861,590	4,861,590	4,861,590