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Note 5 - Comprehensive Income - Changes in the Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Balance |  | $ 197,368 | $ 188,443
Other comprehensive (loss) income |  | 7,861 | (2,386)
Other comprehensive income (loss), net |  | 7,861 | (2,386)
Balance |  | 244,452 | 197,368
Accounting Standards Update 2018-02 [Member] |  |  |
Impact of accounting standards change | [1] |  | 0
Accounting Standards Update 2017-08 [Member] |  |  |
Impact of accounting standards change | [2] |  | 0
Accounting Standards Update 2016-01 [Member] |  |  |
Impact of accounting standards change | [3] |  | 0
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |
Balance |  | (4,307) | (1,566)
Other comprehensive (loss) income |  | 7,818 | (2,452)
Other comprehensive income (loss), net |  | 7,818 | (2,452)
Balance |  | 3,511 | (4,307)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Accounting Standards Update 2018-02 [Member] |  |  |
Impact of accounting standards change |  |  | (337)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Accounting Standards Update 2017-08 [Member] |  |  |
Impact of accounting standards change |  |  | 26
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Accounting Standards Update 2016-01 [Member] |  |  |
Impact of accounting standards change |  |  | 22
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
Balance |  | 137 | 59
Other comprehensive (loss) income |  | 43 | 66
Other comprehensive income (loss), net |  | 43 | 66
Balance |  | 180 | 137
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Accounting Standards Update 2018-02 [Member] |  |  |
Impact of accounting standards change |  |  | 12
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Accounting Standards Update 2017-08 [Member] |  |  |
Impact of accounting standards change |  |  | 0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member] |  |  |
Impact of accounting standards change |  |  | 0
AOCI Attributable to Parent [Member] |  |  |
Balance |  | (4,170) | (1,507)
Other comprehensive (loss) income |  | 7,861 | (2,386)
Other comprehensive income (loss), net |  | 7,861 | (2,386)
Balance |  | $ 3,691 | (4,170)
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018-02 [Member] |  |  |
Impact of accounting standards change | [1] |  | (325)
AOCI Attributable to Parent [Member] | Accounting Standards Update 2017-08 [Member] |  |  |
Impact of accounting standards change | [2] |  | 26
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member] |  |  |
Impact of accounting standards change | [3] |  | $ 22
[1] | As described in more detail in the Recent Accounting Pronouncements - Adopted section of Note 2, this reclassification resulted from adoption of Accounting Standards Update (ASU) 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, effective January 1, 2018.
[2] | As described in more detail in the Recent Accounting Pronouncements - Adopted section of Note 2, this reclassification resulted from adoption of ASU 2017-08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20), effective January 1, 2018.
[3] | As described in more detail in the Recent Accounting Pronouncements - Adopted section of Note 2, this reclassification resulted from adoption of ASU 2016-01, Recognition and Measurement of Financial Assets and Liabilities, effective January 1, 2018.

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