Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Consolidated Balance Sheets [Abstract]
Receivables, allowances	$ 1,324	$ 1,296
Intangible assets, accumulated amortization	12,704	11,772
Dosimetry devices, accumulated depreciation	$ 6,845	$ 6,197
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	9,811,668	9,727,264
Common stock, shares outstanding	9,811,668	9,727,264