Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2014
Consolidated revenues $ 37,547 $ 38,147  
Consolidated operating income 6,141 5,425  
Consolidated Assets 210,847   216,586
Radiation Measurement [Member]      
Consolidated revenues 26,491 28,183  
Consolidated operating income 9,384 8,829  
Consolidated Assets 142,577   148,151
Medical Physics [Member]      
Consolidated revenues 8,484 7,739  
Consolidated operating income 618 433  
Consolidated Assets 39,295   38,851
Medical Products [Member]      
Consolidated revenues 2,572 2,225  
Consolidated operating income 334 (288)  
Consolidated Assets 48,337   48,164
Eliminations [Member]      
Consolidated Assets (19,362)   (18,580)
Corporate [Member]      
Consolidated operating income $ (4,195) $ (3,549)