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Note 4 - Debt (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Fixed Charge Coverage Ratio [Table Text Block]

Fiscal Quarter Ratio

      
       

June 30, 2020

  0.85to1.00 

September 30, 2020

  0.95to1.00 

December 31, 2020

  1.05to1.00 

March 31, 2021 

  1.15to1.00 
June 30, 2021 and thereafter  1.15to1.00