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Note 6 - Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Tables)
 3 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Components of Agreement Obligation [Table Text Block]
    March 31, 2016   December 31, 2015
Members’ interest subject to mandatory redemption   $ 40,000     $ 40,000  
Net accumulated earnings     6,211       10,438  
Total liability   $ 46,211     $ 50,438  
Schedule of Changes in Noncontrolling Interests and Joint Ventures [Table Text Block]
    Three Months Ended
March 31,
    2016   2015
         
Balance, beginning of period   $ (91 )   $ 7,462  
Net (loss) income attributable to noncontrolling interest included in equity     (8 )     292  
Balance, end of period   $ (99 )   $ 7,754