Note 14 - Financing Agreements - Term A Facility and Revolving Facility Margins (Details) - Term A Facility and Revolving Facility [Member]	12 Months Ended
	Dec. 31, 2020
Base Rate [Member] | Total Net Leverage Ratio is Less than or Equal to 1.00:1.00 [Member]
Margin	0.25%
Base Rate [Member] | Total Net Leverage Ratio is Greater than 1.00:1.00 but Less than or Equal to 2.00:1.00 [Member]
Margin	0.50%
Base Rate [Member] | Total Net Leverage Ratio is Greater than 2.00:1.00 [Member]
Margin	0.75%
Eurodollar [Member] | Total Net Leverage Ratio is Less than or Equal to 1.00:1.00 [Member]
Margin	1.25%
Eurodollar [Member] | Total Net Leverage Ratio is Greater than 1.00:1.00 but Less than or Equal to 2.00:1.00 [Member]
Margin	1.50%
Eurodollar [Member] | Total Net Leverage Ratio is Greater than 2.00:1.00 [Member]
Margin	1.75%