Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Consolidated Balance Sheets [Abstract]
Receivables, allowances	$ 1,133	$ 1,088
Intangible assets, accumulated amortization	11,395	9,696
Dosimetry devices, accumulated depreciation	$ 9,511	$ 8,879
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	9,562,320	9,493,368
Common stock, shares outstanding	9,562,320	9,493,368