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Note 5 - Derivatives (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Unrealized Gain (Loss) on Derivatives			$ (5,288,000)	$ 4,523,000
Asset Pledged as Collateral [Member] | Interest Rate Swap Agreements [Member]
Securities Received as Collateral	$ 1,000,000		1,000,000
Designated as Hedging Instrument [Member]
Investment Owned, Cost	220,600,000		220,600,000
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	2,200,000		2,200,000
Derivative, Amount of Hedged Item	60,000,000		60,000,000
Not Designated as Hedging Instrument [Member]
Unrealized Gain (Loss) on Derivatives	(149,000)	$ (107,000)	201,000	$ 266,000
Interest Rate Swap [Member]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 1,000,000		$ 1,000,000

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Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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Cost of the investment.

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