Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Sep. 30, 2010
Consolidated Balance Sheets
Receivables, allowances	$ 954	$ 852
Intangible assets, accumulated amortization	6,092	5,374
Dosimetry devices, accumulated depreciation	$ 10,099	$ 8,894
Preferred stock, par value	$ 0.1	$ 0.1
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.1	$ 0.1
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	9,490,207	9,452,765
Common stock, shares outstanding	9,490,207	9,452,765