Note 5 - Derivatives (Details Textual) - USD ($) |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
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| Unrealized Gain (Loss) on Derivatives | $ 3,260,000 | $ (5,343,000) | |||
| Designated as Hedging Instrument [Member] | |||||
| Investment Owned, Cost | $ 175,900,000 | 175,900,000 | $ 179,400,000 | ||
| Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) | 3,000,000 | 3,000,000 | 2,100,000 | ||
| Derivative, Amount of Hedged Item | 60,000,000 | 60,000,000 | $ 60,000,000 | ||
| Not Designated as Hedging Instrument [Member] | |||||
| Unrealized Gain (Loss) on Derivatives | (63,000) | $ 197,000 | 356,000 | $ 269,000 | |
| Interest Rate Swap [Member] | |||||
| Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | $ 982,000 | $ 982,000 | |||
| X | ||||||||||
- Definition Amount of hedged item in hedging relationship. Excludes hedged asset or liability. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk. Excludes cumulative basis adjustment related to foreign exchange risk. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition 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. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Cost of the investment. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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