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Note 4 - Debt (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Leverage Ratios [Table Text Block]
Fiscal Quarter Ratio
            
             
March 31, 2020
    
0.75
to
1.00
  
June 30, 2020
    
0.85
to
1.00
  
September 30, 2020
    
0.95
to
1.00
  
December 31, 2020
    
1.05
to
1.00
  
March 31, 2021 and thereafter
    
1.15
to
1.00