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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

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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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