Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Sep. 30, 2015
Consolidated Balance Sheets [Abstract]
Receivables, allowances	$ 1,625	$ 1,556
Intangible assets, accumulated amortization	39,605	38,662
Dosimetry devices, accumulated depreciation	$ 5,761	$ 5,282
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	9,734,340	9,641,532
Common stock, shares outstanding	9,734,340	9,641,532