Note 12 - Financing Agreements - Revolving Facility Margins (Details) - Revolving Credit Facility [Member]	6 Months Ended
	Jun. 30, 2021
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%