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Note 10 - Borrowings (Details Textual) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 29, 2018 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2009 | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2003 USD ($) | Dec. 22, 2016 USD ($)
Long-term Debt, Total |  |  |  |  |  | $ 120,721,000 | $ 120,800,000 |  |  |
Advances from Federal Home Loan Banks, Total |  |  |  |  |  | 90,000,000.0 | 90,000,000.0 |  |  |
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, Total |  |  |  |  |  | $ 90,000,000.0 |  |  |  |
Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate for Year |  |  |  |  |  | 3.26% |  |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged |  |  |  |  |  | $ 240,000,000.0 |  |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds |  |  |  |  |  | 73,600,000 |  |  |  |
Debt Issuance Costs, Net, Total |  |  |  |  |  | 318,000 |  |  |  |
Amortization of Debt Issuance Costs |  |  |  |  |  | 111,000 | 112,000 | $ 112,000 |  |
Subordinated Debt, Ending Balance |  |  |  |  |  | 9,811,000 | 9,782,000 |  |  |
Interest Expense, Subordinated Notes and Debentures |  |  |  |  |  | 933,000 | 991,000 | 1,118,000 |  |
Long-term Debt, Gross |  |  |  |  |  | 121,039,000 |  |  |  |
Federal Reserve Bank Advances [Member] |  |  |  |  |  |  |  |  |  |
Loans Pledged as Collateral |  |  |  |  |  | 25,100,000 |  |  |  |
Pledged Assets Separately Reported, Loans Pledged as Collateral, at Fair Value, Total |  |  |  |  |  | 16,900,000 |  |  |  |
Short-term Debt, Total |  |  |  |  |  | 0 |  |  |  |
Correspondent Bank Agreement [Member] | Zions Bank [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | 5,000,000 | 5,000,000 |  |  |
Long-term Line of Credit, Total |  |  |  |  |  | 0 | 0 |  |  |
Interest Expense, Debt, Total |  |  |  |  |  | 0 | 0 | 2,000 |  |
Federal Home Loan Bank Borrowings [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | 2,000,000.0 |  |  |  |
Long-term Line of Credit, Total |  |  |  |  |  | 0 | 0 |  |  |
Interest Expense, Debt, Total |  |  |  |  |  | $ 3,000,000.0 | 2,700,000 | 2,200,000 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  |  |  |  |  | 2.40% |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  |  |  |  |  | 4.23% |  |  |  |
Federal Home Loan Bank Advances [Member] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  | $ 90,000,000 |  |  |  |
Long Term Debt, Additional Available Amount |  |  |  |  |  | 73,600,000 |  |  |  |
Debt Issuance Costs, Net, Total |  |  |  |  |  | (0) |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | $ 90,000,000 |  |  |  |
Federal Home Loan Bank Advances [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  |  |  |  |  | 1 year 6 months |  |  |  |
Federal Home Loan Bank Advances [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  |  |  |  |  | 2 years 8 months 12 days |  |  |  |
Federal Home Loan Bank Advances, Callable Quarterly [Member] |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, Total |  |  |  |  |  | $ 60,000,000.0 |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  | 12,000,000 |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 12,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  | 7.00%
Debt Issuance Costs, Net, Total |  |  |  |  |  | (0) | 73,000 |  |  | $ 374,000
Interest Expense, Long-term Debt, Total |  |  |  |  |  | $ 913,000 | $ 915,000 | $ 915,000 |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  | 7.60% | 7.60% | 7.60% |  |
Amortization of Debt Issuance Costs |  |  |  |  |  | $ 73,000 | $ 75,000 | $ 75,000 |  |
Long-term Debt, Gross |  |  |  |  |  | 12,000,000 |  |  |  |
Senior Notes [Member] | Accrued Expenses and Other Liabilities [Member] |  |  |  |  |  |  |  |  |  |
Interest Payable |  |  |  |  |  | 23,000 | 23,000 |  |  |
Subordinated Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 10,000,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.25% |  |  |  |  |  |  |  |  |
Subordinated Notes [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 3.325% |  |  |  |  |  |  |  |  |
Subordinated Debt [Member] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  | 9,811,000 |  |  |  |
Interest Expense, Debt, Total |  |  |  |  |  | 654,000 | 654,000 | 656,000 |  |
Debt Issuance Costs, Net, Total | $ 291,000 |  |  |  |  | 189,000 | 218,000 |  |  |
Long-term Debt, Gross |  |  |  |  |  | 10,000,000 |  |  |  |
Junior Subordinated Debt [Member] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  | 8,119,000 |  |  |  |
Interest Expense, Debt, Total |  |  | $ 1,700,000 | $ 700,000 |  |  |  |  |  |
Debt Issuance Costs, Net, Total |  |  |  |  |  | 129,000 | 138,000 |  |  |
Amortization of Debt Issuance Costs |  |  |  |  |  | 9,000 | 8,000 | 8,000 |  |
Interest Payable |  |  |  |  |  | $ 4,000 | 5,000 |  |  |
Subordinated Debt, Ending Balance |  |  |  |  |  |  |  |  | $ 8,000,000.0 |
Payments of Debt Issuance Costs |  |  |  |  |  |  |  |  | $ 240,000 |
Excess Tier One Risk Based Capital to Risk Weighted Assets |  |  |  |  |  |  |  |  | 0.25 |
Debt, Weighted Average Interest Rate |  |  |  |  |  | 3.37% |  |  |  |
Number of Consecutive Quarters for Interest Deferment |  |  |  |  | 20 |  |  |  |  |
Interest Expense, Subordinated Notes and Debentures |  |  |  |  |  | $ 279,000 | 337,000 | 462,000 |  |
Long-term Debt, Gross |  |  |  |  |  | $ 8,248,000 |  |  |  |
Junior Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  | 3.15% |  |  |  |
Notes Payable, Other Payables [Member] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  | $ 791,000 |  |  |  |
Debt Instrument, Term (Year) |  | 9 years |  |  |  |  |  |  |  |
Interest Expense, Debt, Total |  |  |  |  |  | 15,000 | 19,000 | $ 23,000 |  |
Debt Instrument, Face Amount |  | $ 2,000,000.0 |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.75% |  |  |  |  |  |  |  |
Debt Issuance Costs, Net, Total |  |  |  |  |  | (0) |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | $ 791,000 | $ 994,000 |  |  |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid |  | $ 234,000 |  |  |  |  |  |  |  |

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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69F -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495745-112612 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69E -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495743-112612 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1F -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611 + Details
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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5086-111524 + Details
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