Note 5 - Bank Debt - Maximum Leverage Ratio (Details) - Credit Agreement [Member]	Jun. 30, 2020
Periods Ended March 31, 2020 and June 30, 2020 [Member]
Maximum Leverage Ratio	4.00
Periods Ended September 30, 2020 ad December 31, 2020 [Member]
Maximum Leverage Ratio	3.50
Periods Ended March 31, 2021 and June 30, 2021 [Member]
Maximum Leverage Ratio	3.25
Periods Ended September 30, 2021 and December 31, 2021 [Member]
Maximum Leverage Ratio	3.00
Period Ended March 31, 2022 and Thereafter [Member]
Maximum Leverage Ratio	2.50