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Note 11 - Contract Costs (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Capitalized Contract Cost [Table Text Block]
   
Year ended
December 31,
2018
(1)
  
         
Balance, beginning of period
   $
1,404
  
Capitalization of costs
    
913
  
Amortization of costs
    
(927
 )
Balance, end of period
   $
1,390
  
   
Year ended December 31,
2018
  
         
Balance, beginning of period
   $
127,003
  
Deferral of costs
    
163,447
  
Recognized costs
1
    
(183,923
 )
Balance, end of period
   $
106,527