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Note 2 - Acquisitions Dispositions (Details) - Adjusted Pro Forma Effect of the Acquisitions on the Results of Operations (BGI [Member], USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
BGI [Member] |  |  |  |
Note 2 - Acquisitions Dispositions (Details) - Adjusted Pro Forma Effect of the Acquisitions on the Results of Operations [Line Items] |  |  |  |
Revenues | $ 18,540 | $ 14,592 | $ 35,258 | $ 27,726
Net income | $ 3,060 | $ 2,467 | $ 5,019 | $ 4,863
Basic | $ 0.87 | $ 0.72 | $ 1.43 | $ 1.43
Diluted | $ 0.84 | $ 0.69 | $ 1.38 | $ 1.36

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