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Note 12 - Fair Value Measurements - Carrying Values and Estimated Values of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financial Assets |  |  |
Securities available for sale | $ 119,510 | $ 99,857 | [1]
Securities held to maturity | 18,828 |  |
Restricted securities | 1,701 | 1,688 | [1]
Bank owned life insurance | 17,193 | 13,991 | [1]
Reported Value Measurement [Member] |  |  |
Financial Assets |  |  |
Cash and short-term investments | 23,070 | 28,618 |
Securities available for sale | 119,510 | 99,857 |
Securities held to maturity | 18,828 | 43,408 |
Restricted securities | 1,701 | 1,688 |
Loans held for sale | 675 | 419 |
Loans, net | 569,959 | 537,847 |
Bank owned life insurance | 17,193 | 13,991 |
Accrued interest receivable | 2,163 | 2,113 |
Financial Liabilities |  |  |
Deposits | 689,815 | 670,566 |
Subordinated debt | 4,974 | 4,965 |
Junior subordinated debt | 9,279 | 9,279 |
Accrued interest payable | 173 | 139 |
Estimate of Fair Value Measurement [Member] |  |  |
Financial Assets |  |  |
Cash and short-term investments | 23,070 | 28,618 |
Securities available for sale | 119,510 | 99,857 |
Securities held to maturity | 18,796 | 42,394 |
Restricted securities | 1,701 | 1,688 |
Loans held for sale | 675 | 419 |
Loans, net | 572,508 | 528,643 |
Bank owned life insurance | 17,193 | 13,991 |
Accrued interest receivable | 2,163 | 2,113 |
Financial Liabilities |  |  |
Deposits | 689,016 | 668,567 |
Subordinated debt | 5,238 | 5,035 |
Junior subordinated debt | 9,460 | 7,952 |
Accrued interest payable | 173 | 139 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Financial Assets |  |  |
Cash and short-term investments | 23,070 | 28,618 |
Securities available for sale |  |  |
Securities held to maturity |  |  |
Restricted securities |  |  |
Loans held for sale |  |  |
Loans, net |  |  |
Bank owned life insurance |  |  |
Accrued interest receivable |  |  |
Financial Liabilities |  |  |
Deposits |  |  |
Subordinated debt |  |  |
Junior subordinated debt |  |  |
Accrued interest payable |  |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Financial Assets |  |  |
Cash and short-term investments |  |  |
Securities available for sale | 119,510 | 99,857 |
Securities held to maturity | 17,274 | 40,885 |
Restricted securities | 1,701 | 1,688 |
Loans held for sale | 675 | 419 |
Loans, net |  |  |
Bank owned life insurance | 17,193 | 13,991 |
Accrued interest receivable | 2,163 | 2,113 |
Financial Liabilities |  |  |
Deposits | 571,952 | 551,347 |
Subordinated debt |  |  |
Junior subordinated debt |  |  |
Accrued interest payable | 173 | 139 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Financial Assets |  |  |
Cash and short-term investments |  |  |
Securities available for sale |  |  |
Securities held to maturity | 1,522 | 1,509 |
Restricted securities |  |  |
Loans held for sale |  |  |
Loans, net | 572,508 | 528,643 |
Bank owned life insurance |  |  |
Accrued interest receivable |  |  |
Financial Liabilities |  |  |
Deposits | 117,064 | 117,220 |
Subordinated debt | 5,238 | 5,035 |
Junior subordinated debt | 9,460 | 7,952 |
Accrued interest payable |  |  |
[1] | Derived from audited consolidated financial statements.

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