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Note 3 - Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Components of Agreement Obligation [Table Text Block]
    March 31,
2017		   December 31,
2016
Members’ interest subject to mandatory redemption   $
40,000
     $
40,000
  
Net accumulated earnings    
4,183
      
5,230
  
Total liability   $
44,183
     $
45,230
  
Schedule of Changes in Noncontrolling Interests and Joint Ventures [Table Text Block]
    Three Months Ended
March 31,
    2017   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
 )