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Note 8 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Tables)
 9 Months Ended
Sep. 30, 2015
Notes Tables  
Schedule of Components of Agreement Obligation [Table Text Block]
   
September 30,
2015
  
December 31,
2014
                 
Member’s interest subject to mandatory redemption   $ 20,000     $ 20,000  
Accumulated undistributed earnings attributable to this interest     6,892       6,079  
Earnings distributed     (5,114 )     (3,200 )
Total liability   $ 21,778     $ 22,879  
Schedule of Changes in Noncontrolling Interests and Joint Ventures [Table Text Block]
    Nine Months Ended
September 30,
    2015   2014
         
Balance, beginning of period   $ 7,462     $ 4,097  
Net income attributable to noncontrolling interest included in equity     2,948       3,238  
Distributions to noncontrolling interest owners     (3,402 )     (1,190 )
Balance, end of period   $ 7,008     $ 6,145