The sum of the periodic adjustments of the differences between acquired loans and purchase prices that are charged against earnings. This is called accretion if the loan was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

No definition available.

Note 4 - Loans (Details Textual) $ in Thousands	3 Months Ended		12 Months Ended
Note 4 - Loans (Details Textual) $ in Thousands	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Apr. 24, 2020 USD ($)
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total	$ 1,300		$ 1,500
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	58	$ 158
Impaired Financing Receivable, Recorded Investment, Total	$ 9,952		10,399
Percentage of Collateral Coverage to Loan Balance to Consider Restructured Loan to Performing and Accrual Status	100.00%
Financing Receivable, Troubled Debt Restructuring	$ 6,300		$ 6,500
Financing Receivable, Number of Contracts Qualified as Troubled Debt Restructuring	97
Troubled Debt Restructurings Percentage of Gross Portfolio Loans	0.60%		0.63%
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts	0
Doubtful Grade Remaining Outstanding Period, Minimum (Month)	180 days
Mortgage Loans in Process of Foreclosure, Amount	$ 141		$ 100
Percentage of Unallocated Allowance Amount out of Allowance for Loan and Lease Losses	3.00%		3.00%
Loans and Leases Receivable, Allowance, Ending Balance	$ 15,067		$ 12,231
Percentage of Allowance for Loan and Lease Losses out of Net Loans	1.43%		1.18%
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset	$ 276,300		$ 275,100
Reserve for Unfunded Commitments Included in Other Liabilities	$ 695		695
Maximum Loan to Value, Percentage	80.00%
Percentage of Loan Portfolio Secured by Real Estate	84.00%
Subsequent Event [Member]
Financing Receivable, Number of Short Term Loan Modification Requests				124
Financing Receivable, Short Term Loan Modification Requests, Amount				$ 82,900
Financing Receivable, Number of Short Term Loan Modification Request Approved				120
Financing Receivable, Short Term Loan Modifications Requested, Approved, Amount				$ 78,000
Performing Financial Instruments [Member]
Impaired Financing Receivable, Recorded Investment, Total	$ 4,700		4,800
Financing Receivable, Number of Contracts Qualified as Troubled Debt Restructuring	93
Merchants Holding Company [Member]
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total		1,500
Accretion (Amortization) of Discounts and Premiums, Acquired Loans	$ 163	$ 48
Federal Home Loan Bank of San Francisco [Member]
Loans Pledged as Collateral	$ 549,000		$ 542,100