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Note 4 - Subsidiaries and Joint Ventures With Noncontrolling Owners' Interests - Changes In Noncontrolling Owners' Interests (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Balance, beginning of period     $ 656 $ (91)
Net income attributable to noncontrolling interest included in equity $ 901 $ 520 1,272 512
Distributions to noncontrolling interest owners    
Balance, end of period $ 1,928 $ (421) $ 1,928 $ (421)