Note 14 - Financing Agreements - Revolving Facility Commitment Fees (Details) - Revolving Credit Facility [Member]	12 Months Ended
	Dec. 31, 2020
Total Net Leverage Ratio is Less than or Equal to 1.00:1.00 [Member]
Commitment fee	0.25%
Total Net Leverage Ratio is Greater than 1.00:1.00 but Less than or Equal to 2.00:1.00 [Member]
Commitment fee	0.375%
Total Net Leverage Ratio is Greater than 2.00:1.00 [Member]
Commitment fee	0.50%