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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2009 | Dec. 31, 2015
Cash and Cash Equivalents, at Carrying Value, Ending Balance | $ 118,561 | $ 51,546 | $ 35,857 |  | $ 42,363
Interest-bearing Deposits in Banks and Other Financial Institutions | 105,800 | 39,400 |  |  |
Cash Reserve Deposit Required and Made | 4,400 | 9,700 |  |  |
Interest Income, Securities, Operating, Tax Exempt | 3,400 | 3,700 | 3,100 |  |
Goodwill, Impairment Loss | 0 | 0 | 0 |  |
Goodwill, Ending Balance | 16,127 | 16,127 |  |  |
Allowance for Loan and Lease Losses, Period Increase (Decrease), Total | $ 600 |  |  | $ (200) |
Fair Value, Collateral Dependent Loans, Percentage of Appraised or Internally Estimated Value of Property | 85.00% |  |  |  |
Amount of Collateral-dependent Impaired Loans Measured for Impairment By Utilizing Third-party Appraisals | $ 17,000 |  |  |  |
Percentage of Collateral-dependent Impaired Loans Measured for Impairment By Utilizing Third-party Appraisals | 83.00% |  |  |  |
Amount of Collateral-Dependent Impaired Loans Measured for Impairment Using Internal Evaluations | $ 3,500 |  |  |  |
Percentage of Collateral-dependent Impaired Loans Measured for Impairment Using Internal Evaluations | 17.00% |  |  |  |
Loans and Leases Receivable, Impaired, Commitment to Lend | $ 0 |  |  |  |
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Ending Balance | 0 | 0 |  |  |
Other Real Estate, Ending Balance | 0 | 0 | 533 |  | $ 4,932
Other than Temporary Impairment Losses, Investments, Total | 0 |  |  |  |
Advertising Expense | $ 2,200 | $ 2,400 | $ 2,400 |  |
Employee Stock Option [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 0 | 0 |  |
Bank Premises and Equipment [Member] | Minimum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |  |  |
Bank Premises and Equipment [Member] | Maximum [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |  |  |
Originated Before January 1, 2010 [Member] |  |  |  |  |
Percent of Loan Portfolio to Total Loans |  |  |  | 11.00% |

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