Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Sep. 30, 2011
Consolidated Balance Sheets [Abstract]
Receivables, allowances	$ 842	$ 794
Intangible assets, accumulated amortization	7,509	7,355
Dosimetry devices, accumulated depreciation	$ 10,051	$ 9,728
Preferred stock, par value	$ 0.10	$ 0.10
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	9,514,414	9,462,807
Common stock, shares outstanding	9,514,414	9,462,807