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Note 4 - Debt (Tables)
 3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Fixed Charge Coverage Ratio [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