Note 16 - Subsequent Events - Derivatives Outstanding (Details) - Contingent Interest Rate Swaps [Member] - Rio Grande [Member] - USD ($)		6 Months Ended
	Jul. 12, 2023	Jun. 30, 2023
Initial Notional Amount		$ 86,000,000
Maturity Date		Mar. 28, 2049
Variable Interest Rate Received		3.20%
Maximum [Member]
Initial Notional Amount		$ 5,905,000,000
Subsequent Event [Member]
Initial Notional Amount	$ 123,000
Maturity Date	Jul. 12, 2030
Variable Interest Rate Received	3.40%
Subsequent Event [Member] | Maximum [Member]
Initial Notional Amount	$ 8,500,000