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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, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating Activities:                              
Net income $ 3,543,000 $ 3,128,000 $ 2,714,000 $ 2,530,000 $ 2,822,000 $ 2,939,000 $ 2,734,000 $ 2,942,000 $ 2,856,000 $ 2,749,000 $ 2,442,000 $ 2,097,000 $ 11,915,000 $ 11,437,000 $ 10,144,000
Adjustments to reconcile net income to cash and cash equivalents provided by operating activities:                              
Stock compensation expense                         436,000 487,000 381,000
Unrealized (gain) loss on equity securities                         414,000   194,000
Net change in other assets and liabilities                         16,531,000 21,631,000 12,060,000
Investing Activities:                              
Investment in technology fund                         (100,000) (120,000) 0
Financing Activities:                              
Purchase of treasury stock                         0 (40,000) (13,000)
Tax paid on stock award shares for employees                         (26,000) (85,000) (134,000)
Cash dividends paid                         (3,520,000) (3,522,000) (3,255,000)
Net increase (decrease) in cash and cash equivalents                         (106,211,000) (3,379,000) 124,528,000
Cash and cash equivalents at beginning of year       172,509,000       175,888,000       51,360,000 172,509,000 175,888,000 51,360,000
Cash and cash equivalents at end of year 66,298,000       172,509,000       175,888,000       66,298,000 172,509,000 175,888,000
Parent Company [Member]                              
Operating Activities:                              
Net income                         11,902,000 11,424,000 10,131,000
Adjustments to reconcile net income to cash and cash equivalents provided by operating activities:                              
Equity in undistributed net income of subsidiaries                         (8,312,000) (9,071,000) (8,045,000)
Stock compensation expense                         436,000 487,000 381,000
Unrealized (gain) loss on equity securities                         414,000 (328,000) 194,000
Net change in other assets and liabilities                         (53,000) 191,000 (125,000)
Net cash provided by operating activities                         4,387,000 2,703,000 2,536,000
Investing Activities:                              
Net cash used in investing activities                         (100,000) (120,000) 0
Financing Activities:                              
Purchase of treasury stock                         0 (40,000) (13,000)
Cash dividends paid                         (3,507,000) (3,509,000) (3,242,000)
Net cash used in financing activities                         (3,533,000) (3,634,000) (3,389,000)
Net increase (decrease) in cash and cash equivalents                         754,000 (1,051,000) (853,000)
Cash and cash equivalents at beginning of year       $ 1,943,000       $ 2,994,000       $ 3,847,000 1,943,000 2,994,000 3,847,000
Cash and cash equivalents at end of year $ 2,697,000       $ 1,943,000       $ 2,994,000       $ 2,697,000 $ 1,943,000 $ 2,994,000