Note 23 - Parent Company Condensed Financial Information - Condensed Statements of Cash Flows (Details) - USD ($)	3 Months Ended												12 Months Ended
	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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities:
Net Income	$ 2,822,000	$ 2,939,000	$ 2,734,000	$ 2,942,000	$ 2,856,000	$ 2,749,000	$ 2,442,000	$ 2,097,000	$ 2,406,000	$ 2,918,000	$ 2,864,000	$ 2,150,000	$ 11,437,000	$ 10,144,000	$ 10,338,000
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Stock compensation expense													487,000	381,000	288,000
Unrealized (gain) loss on equity securities														194,000
Net change in other assets and liabilities													21,631,000	12,060,000	14,077,000
Investing Activities:
Investment in technology fund													(120,000)	0	0
Financing Activities:
Purchase of treasury stock													(40,000)	(13,000)	(2,000)
Tax paid on stock award shares for employees													(85,000)	(134,000)	(42,000)
Dividends paid													(3,522,000)	(3,255,000)	(3,209,000)
Parent Company [Member]
Operating Activities:
Net Income													11,424,000	10,131,000	10,325,000
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Equity in undistributed net income of subsidiaries													(9,071,000)	(8,045,000)	(6,299,000)
Stock compensation expense													487,000	381,000	288,000
Unrealized (gain) loss on equity securities													(328,000)	194,000	(32,000)
Net change in other assets and liabilities													191,000	(125,000)	(40,000)
Net cash provided by operating activities													2,703,000	2,536,000	4,242,000
Investing Activities:
Net cash used in investing activities													(120,000)	0	0
Financing Activities:
Purchase of treasury stock													(40,000)	(13,000)	(2,000)
Dividends paid													(3,509,000)	(3,242,000)	(3,196,000)
Net cash used in financing activities													(3,634,000)	(3,389,000)	(3,240,000)
Net increase (decrease) in cash and cash equivalents													(1,051,000)	(853,000)	1,002,000
Cash and cash equivalents at beginning of year				$ 2,994,000				$ 3,847,000				$ 2,845,000	2,994,000	3,847,000	2,845,000
Cash and cash equivalents at end of year	$ 1,943,000				$ 2,994,000				$ 3,847,000				$ 1,943,000	$ 2,994,000	$ 3,847,000