Note 9 - Fair Value Measurements - Schedule of Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Debt securities available-for-sale (at fair value)	$ 24,534		$ 25,693
Reported Value Measurement [Member]
Cash and cash equivalents	128,909		169,142
Debt securities available-for-sale (at fair value)	24,534		25,693
Federal Home Loan Bank of Boston stock	2,242		2,697
Loans, net	1,293,469		1,305,508
Accrued interest receivable	4,877		5,296
Deposits	1,257,978		1,308,960
Borrowings	34,495		44,563
Assets held for sale		$ 2,256
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	128,909		169,142
Debt securities available-for-sale (at fair value)	24,534		25,693
Loans, net	1,269,988		1,272,387
Accrued interest receivable	4,877		5,296
Deposits	1,258,464		1,309,492
Borrowings	33,560		43,492
Assets held for sale		2,950
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	128,909		169,142
Debt securities available-for-sale (at fair value)	0		0
Loans, net	0		0
Accrued interest receivable	0		0
Deposits	0		0
Borrowings	0		0
Assets held for sale		0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0		0
Debt securities available-for-sale (at fair value)	24,534		25,693
Loans, net	0		0
Accrued interest receivable	4,877		5,296
Deposits	1,258,464		1,309,492
Borrowings	33,560		43,492
Assets held for sale		2,950
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0		0
Debt securities available-for-sale (at fair value)	0		0
Loans, net	1,269,988		1,272,387
Accrued interest receivable	0		0
Deposits	0		0
Borrowings	$ 0		$ 0
Assets held for sale		$ 0

Fair value of the interest receivables.

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Amount of assets held-for-sale that are not part of a disposal group.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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