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Note 2 - Acquisitions Dispositions (Details) (USD $)
6 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Apr. 15, 2014
BGI [Member]
Aug. 12, 2013
Nusonics Product Line Business [Member]
Note 2 - Acquisitions Dispositions (Details) [Line Items]        
Payments to Acquire Businesses, Net of Cash Acquired $ 13,817,000 $ 1,721,000    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net     10,268,000  
Proceeds from Divestiture of Businesses   661,000   661,000
Disposal Group Not Discontinued Operation Carrying Value       193,000
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax       $ 468,000