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Note 4 - Debt (Tables)
 6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Leverage Ratios [Table Text Block]
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