Note 3 - Investments in Securities - Schedule of Available-for-Sale Securities in Unrealized Loss Position (Details) $ in Thousands	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)
Mortgage-Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positionssecurities	8	8
Securities available for sale, fair value, less than twelve months	$ 10,820	$ 11,444
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(63)	(62)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,763	2,767
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(22)	(25)
Debt Securities, Available-for-Sale, Unrealized Loss Position	13,583	14,211
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	$ (85)	$ (87)
Collateralized Mortgage-Backed Securities [Member]
Mortgage-Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positionssecurities	1	1
Securities available for sale, fair value, less than twelve months	$ 0	$ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,356	1,362
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(4)	(3)
Debt Securities, Available-for-Sale, Unrealized Loss Position	1,356	1,362
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	$ (4)	$ (3)
Collateralized Mortgage Obligations [Member]
Mortgage-Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positionssecurities	6	3
Securities available for sale, fair value, less than twelve months	$ 8,174	$ 3,778
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(30)	(15)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,407	1,405
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(18)	(22)
Debt Securities, Available-for-Sale, Unrealized Loss Position	9,581	5,183
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	$ (48)	$ (37)
Corporate Debt Securities [Member]
Mortgage-Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positionssecurities	1	4
Securities available for sale, fair value, less than twelve months	$ 2,646	$ 7,666
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(33)	(47)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-Sale, Unrealized Loss Position	2,646	7,666
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss	$ (33)	$ (47)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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