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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.