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Note 3 - Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests - Changes in Noncontrolling Owners' Interests (Details) - Subsidiaries [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Balance, beginning of period $ 656 $ (91)
Net income attributable to noncontrolling interest included in equity 371 (8)
Distributions to noncontrolling interest owners
Balance, end of period $ 1,027 $ (99)