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Note 2 - Debt (Tables)
 6 Months Ended
Jun. 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
    
4.50
to
1.00
  
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