Segment Information (Details)	3 Months Ended
	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($)	Sep. 30, 2016 USD ($)
Segment Reporting Information [Line Items]
Reporting segments | segment	2
Consolidated revenues	$ 37,572,000	$ 36,530,000
Consolidated operating income	7,442,000	6,252,000
Consolidated Assets	187,752,000		$ 190,816,000
Eliminations [Member]
Segment Reporting Information [Line Items]
Consolidated Assets	(13,207,000)		(12,918,000)
Radiation Measurement [Member]
Segment Reporting Information [Line Items]
Consolidated revenues	27,632,000	24,704,000
Consolidated operating income	11,232,000	8,898,000
Consolidated Assets	157,499,000		160,560,000
Medical Physics [Member]
Segment Reporting Information [Line Items]
Consolidated revenues	9,940,000	9,353,000
Consolidated operating income	679,000	778,000
Consolidated Assets	43,460,000		$ 43,174,000
Medical Products [Member]
Segment Reporting Information [Line Items]
Consolidated revenues	0	2,473,000
Consolidated operating income		490,000
Corporate [Member]
Segment Reporting Information [Line Items]
Consolidated operating income	$ (4,469,000)	$ (3,914,000)