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Note 11 - Contract Costs (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Capitalized Contract Cost [Table Text Block]
   
Three months ended
June 30, 2018
    
Six months ended
June 30, 2018
(1
)
  
                 
Balance, beginning of period
   $
1,378
     $
1,404
  
Capitalization of costs
    
244
      
439
  
Amortization of costs
    
(268
 )    
(489
 )
Balance, end of period
   $
1,354
     $
1,354
  
   
Three months ended
June 30, 2018
    
Six months ended
June 30, 2018
  
                 
Balance, beginning of period
   $
115,660
     $
127,003
  
Deferral of costs
    
41,177
      
87,160
  
Recognition of costs
1
    
(41,380
 )    
(98,708
 )
Balance, end of period
   $
115,456
     $
115,456