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Note 7 - Supplemental Equity and Accumulated Other Comprehensive Income (Loss) (Details Textual) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
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Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | $ 0 | $ 0 |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance | 1,146,266 | 1,058,292 |  | $ 1,096,425 | $ 1,109,469 | $ 1,079,061 | $ 997,819 | $ 960,082 | $ 949,627
Accumulated Other Comprehensive Income (Loss), Derivative Qualifying as Hedge, Excluded Component, Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance | $ (5,769) |  |  |  |  |  |  |  |
Forecast [Member] |  |  |  |  |  |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent |  |  | $ 919 |  |  |  |  |  |

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