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Note 3 - Debt (Tables)
 3 Months Ended
Mar. 31, 2019
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
4.25
to
1.00
  
September 30, 2018
not applicable
  
December 31, 2018
 3.50
to
1.00
  
March 31, 2019
not applicable
  
June 30, 2019
 3.00
to
1.00
  
September 30, 2019 and thereafter
 2.75
to
1.00