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Note 4 - Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Components of Agreement Obligation [Table Text Block]
    As of December 31,
    2016   2015
Members’ interest subject to mandatory redemption   $
40,000
     $
40,000
  
Net accumulated earnings    
5,230
      
10,438
  
Total liability   $
45,230
     $
50,438
  
Schedule of Changes in Noncontrolling Interests and Joint Ventures [Table Text Block]
    Years Ended December 31,
    2016   2015   2014
Balance, beginning of period   $
(91
 )   $
7,462
     $
4,097
  
Net income attributable to noncontrolling interest included in equity    
1,826
      
3,216
      
4,556
  
Change due to amendment    
--
      
(7,367
 )    
--
  
Distributions to noncontrolling interests owners    
(1,079
 )    
(3,402
 )    
(1,191
 )
Balance, end of period   $
656
     $
(91
 )   $
7,462