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Note 8 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners’ Interests (Tables)
 6 Months Ended
Jun. 30, 2015
Noncontrolling Interest [Abstract]  
Schedule of Components of Agreement Obligation [Table Text Block]
    June 30,
2015		   December 31,
2014
         
Member’s interest subject to mandatory redemption   $ 20,000     $ 20,000  
Accumulated undistributed earnings attributable to this interest     5,358       6,079  
Earnings distributed     (4,533 )     (3,200 )
Total liability   $ 20,825     $ 22,879  
Schedule of Changes in Noncontrolling Interests and Joint Ventures [Table Text Block]
    Six Months Ended
June 30,
    2015   2014
         
Balance, beginning of period   $ 7,462     $ 4,097  
Net income attributable to noncontrolling interest included in equity     1,839       1,520  
Distributions to noncontrolling interest owners     (2,451 )     (1,190 )
Balance, end of period   $ 6,850     $ 4,427