Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Current assets:
Cash and cash equivalents	$ 50,752	$ 31,388
Short-term investments	19,960	4,926
Trade accounts receivable, net of allowance of $280 and $411	16,229	19,761
Current portion of notes receivable	3,806	2,100
Inventories, net	83,894	72,390
Deferred income tax assets	6,689	6,356
Other current assets	5,898	5,660
Total current assets	187,228	142,581
Rental equipment, net	27,853	11,945
Property, plant and equipment, net	34,433	34,692
Patents, net of accumulated amortization of $3,507 and $3,268	80	319
Goodwill	1,843	1,843
Non-current deferred income tax assets	307	505
Non-current notes receivable	1,687	3,706
Prepaid income taxes	5,479	979
Other assets	112	231
Total assets	259,022	196,801
Current liabilities:
Accounts payable trade	17,187	5,042
Accrued expenses and other current liabilities	13,978	11,384
Deferred revenue	8,641	774
Deferred income tax liabilities	111	82
Income tax payable	1,275	399
Total current liabilities	41,192	17,681
Non-current deferred income tax liabilities	2,843	2,107
Total liabilities	44,035	19,788
Commitments and contingencies
Stockholders' equity:
Preferred stock, 1,000,000 shares authorized, no shares issued and outstanding
Common stock, $.01 par value, 20,000,000 shares authorized,12,802,160 and 12,702,516 shares issued and outstanding	128	128
Additional paid-in capital	60,633	57,382
Retained earnings	154,451	119,333
Accumulated other comprehensive income (loss)	(225)	170
Total stockholders' equity	214,987	177,013
Total liabilities and stockholders' equity	$ 259,022	$ 196,801