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Note 23 - Parent Company Condensed Financial Information - Condensed Statements of Cash Flows (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Activities:                              
Net income $ 2,406,000 $ 2,918,000 $ 2,864,000 $ 2,150,000 $ 2,499,000 $ 2,527,000 $ 2,104,000 $ 2,136,000 $ 1,590,000 $ 2,112,000 $ 2,194,000 $ 1,556,000 $ 10,338,000 $ 9,266,000 $ 7,452,000
Adjustments to reconcile net income to cash and cash equivalents provided by operating activities:                              
Stock compensation expense                         288,000 192,000 88,000
Unrealized (gain) loss on equity securities                           207,000  
Net change in other assets and liabilities                         14,077,000 13,348,000 13,419,000
Financing Activities:                              
Purchase of treasury stock                         (2,000) (32,000) (16,000)
Taxes paid on stock award shares for employees                         42,000 2,000 2,000
Cash dividends paid                         (3,209,000) (3,101,000) (2,883,000)
Parent Company [Member]                              
Operating Activities:                              
Net income                         10,325,000 9,253,000 7,439,000
Adjustments to reconcile net income to cash and cash equivalents provided by operating activities:                              
Equity in undistributed net income of subsidiaries                         (6,299,000) (3,524,000) (3,496,000)
Stock compensation expense                         288,000 192,000 88,000
Unrealized (gain) loss on equity securities                         (32,000) 207,000
Net change in other assets and liabilities                         (40,000) (89,000) (20,000)
Net cash provided by operating activities                         4,242,000 6,039,000 4,011,000
Investing Activities:                              
Purchase of equity investment                         (1,922,000)
Net cash used in investing activities                         (1,922,000)
Financing Activities:                              
Purchase of treasury stock                         (2,000) (32,000) (16,000)
Taxes paid on stock award shares for employees                         42,000 2,000 2,000
Cash dividends paid                         (3,196,000) (3,088,000) (2,870,000)
Net cash used in financing activities                         (3,240,000) (3,122,000) (2,888,000)
Net increase in cash and cash equivalents                         1,002,000 995,000 1,123,000
Cash and cash equivalents at beginning of year       $ 2,845,000       $ 1,850,000       $ 727,000 2,845,000 1,850,000 727,000
Cash and cash equivalents at end of year $ 3,847,000       $ 2,845,000       $ 1,850,000       $ 3,847,000 $ 2,845,000 $ 1,850,000