Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Supplemental Equity and Accumulated Other Comprehensive Income (Loss) (Details Textual)

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Note 7 - Supplemental Equity and Accumulated Other Comprehensive Income (Loss) (Details Textual) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
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 1,096,425 997,819   $ 1,109,469 $ 1,079,061 $ 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 $ (3,915)      
Scenario, Forecast [Member]              
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent     $ 250