Note 4 - Loans and Allowance for Loan Losses (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Loan and Lease Losses, Write-offs	$ 1,055,000	$ 537,000	$ 536,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	$ 2,835,000	$ 3,173,000
Weighted Average Interest Rate On Loans Receivable	5.65%	5.80%
Mortgage Receivable [Member]
Servicing Asset at Amortized Cost, Ending Balance	$ 29,222	$ 37,350
Commercial Loans [Member]
Servicing Asset at Amortized Cost, Ending Balance	51,381,794	47,206,950
Substandard [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	3,200,000	3,000,000
Troubled Debt Restructurings [Member]
Allowance for Loan and Lease Losses, Period Increase (Decrease), Total	37,379	171,745
Allowance for Loan and Lease Losses, Write-offs	$ 0	$ 0

The weighted-average interest rate on outstanding loans receivable.

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- Definition

Amount of increase (decrease) of allowance reserve for credit loss.

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-Publisher FASB
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-SubTopic 210
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- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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- Definition

The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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- Definition

Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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