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Note 2 - Debt (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Leverage Ratios [Table Text Block]
Fiscal Quarter Ratio
           
             
December 31, 2017
    
4.75
to
1.00
  
March 31, 2018
    
4.50
to
1.00
  
June 30, 2018
    
4.50
to
1.00
  
September 30, 2018
    
not applicable
  
December 31, 2018
    
3.50
to
1.00
  
March 31, 2019
    
3.25
to
1.00
  
June 30, 2019
    
3.00
to
1.00
  
September 30, 2019 and thereafter
    
2.75
to
1.00