Note 6 - Borrowings - Funded Debt to Adjusted Ratio (Details)	12 Months Ended
	Dec. 31, 2022
Funded Debt to Adjusted Ratio Greater than or equal to 3.00 to 1.0 [Member]
Revolving Eurodollar Borrowing	0.75%
ABR Revolving Borrowing	2.50%
Letter of Credit Fee	2.50%
Commitment Fee	0.35%
Funded Debt to Adjusted Ratio Greater than or equal to 2.50 to 1.0 [Member]
Revolving Eurodollar Borrowing	0.25%
ABR Revolving Borrowing	2.00%
Letter of Credit Fee	2.00%
Commitment Fee	0.30%
Funded Debt to Adjusted Ratio Greater than or equal to 1.50 to 1.0 but less than 2.50 to 1.0 [Member]
Revolving Eurodollar Borrowing	0.00%
ABR Revolving Borrowing	1.75%
Letter of Credit Fee	1.75%
Commitment Fee	0.25%
Information related to Funded Debt to Adjusted Ratio Less than 1.50 to 1.0 [Member]
Revolving Eurodollar Borrowing	(0.25%)
ABR Revolving Borrowing	1.50%
Letter of Credit Fee	1.50%
Commitment Fee	0.20%