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Note 3 - Debt (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Leverage Ratios [Table Text Block]
Fiscal Quarter Ratio
  
           
December 31, 2017  
4.75
to
1.00
  
June 30, 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