Note 6 - Borrowings - Funded Debt to Adjusted Ratio (Details)	12 Months Ended
	Dec. 31, 2023
Funded Debt to Adjusted Ratio Greater Than or Equal to 3.50 to 1.0 [Member]
Revolving Commitment ABR Spread	1.25%
Revolving Commitment Term Benchmark Spread	3.00%
Letter of Credit Fee	3.00%
Commitment Fee Rate	0.50%
Funded Debt to Adjusted Ration Greater Than or Equal to 2.50 to 1.0 but less than 3.00 to 1.0 [Member]
Revolving Commitment ABR Spread	0.75%
Revolving Commitment Term Benchmark Spread	2.50%
Letter of Credit Fee	2.50%
Commitment Fee Rate	0.35%
Funded Debt to Adjusted Ration Greater than or Equal to 2.50 to 1.0 but less than 2.50 to 1.0 [Member]
Revolving Commitment ABR Spread	0.25%
Revolving Commitment Term Benchmark Spread	2.00%
Letter of Credit Fee	2.00%
Commitment Fee Rate	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 Commitment ABR Spread	(0.00%)
Revolving Commitment Term Benchmark Spread	1.75%
Letter of Credit Fee	1.75%
Commitment Fee Rate	0.25%
Information related to Funded Debt to Adjusted Ratio Less than 1.50 to 1.0 [Member]
Revolving Commitment ABR Spread	(0.25%)
Revolving Commitment Term Benchmark Spread	1.50%
Letter of Credit Fee	1.50%
Commitment Fee Rate	0.20%