Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Reporting segments | segment			3
Consolidated revenues	$ 37,854	$ 35,467	$ 112,466	$ 111,153
Consolidated operating income	7,713	5,111	21,182	16,882
Consolidated Assets	194,670		194,670		$ 208,744
Eliminations [Member]
Segment Reporting Information [Line Items]
Consolidated Assets	(12,876)		(12,876)		(26,091)
Radiation Measurement [Member]
Segment Reporting Information [Line Items]
Consolidated revenues	27,492	24,143	77,716	77,880
Consolidated operating income	10,294	7,604	29,161	26,402
Consolidated Assets	161,305		161,305		142,850
Medical Physics [Member]
Segment Reporting Information [Line Items]
Consolidated revenues	9,562	8,926	28,948	25,971
Consolidated operating income	756	1,143	2,452	2,082
Consolidated Assets	46,241		46,241		43,677
Medical Products [Member]
Segment Reporting Information [Line Items]
Consolidated revenues	800	2,398	5,802	7,302
Consolidated operating income	141	375	1,063	953
Consolidated Assets					$ 48,308
Corporate [Member]
Segment Reporting Information [Line Items]
Consolidated operating income	$ (3,478)	$ (4,011)	$ (11,494)	$ (12,555)