Note I - Income Taxes - Reconciliation of Federal Income Tax Rate (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Taxes computed at statutory rate, tax	$ 321,000	$ 125,000	$ 571,000
Taxes computed at statutory rate, rate	21.00%	21.00%	34.00%
Tax-exempt interest income, tax	$ (172,000)	$ (206,000)	$ (362,000)
Tax-exempt interest income, rate	(11.00%)	(35.00%)	(22.00%)
Income from BOLI, tax	$ (92,000)	$ (96,000)	$ (302,000)
Income from BOLI, rate	(6.00%)	(16.00%)	(18.00%)
Federal tax credits, tax	$ (20,000)	$ (298,000)	$ (298,000)
Federal tax credits, rate	(1.00%)	(50.00%)	(18.00%)
Other, tax	$ 129,000	$ 50,000	$ (656,000)
Other, rate	8.00%	8.00%	(39.00%)
Impact of tax rate change, tax			$ 3,990,000
Impact of tax rate change, rate			238.00%
Change in valuation allowance for enacted change in tax rates, tax			$ (3,990,000)
Change in valuation allowance for enacted change in tax rates, rate			(238.00%)
Realization of AMT credit, tax		$ (36,000)	$ (742,000)
Realization of AMT credit, rate		(6.00%)	(44.00%)
Other changes in valuation allowance, tax	$ (166,000)	$ 425,000	$ 709,000
Other changes in valuation allowance, rate	(11.00%)	72.00%	42.00%
Totals	$ 0	$ (36,000)	$ (1,080,000)
Total income tax (benefit) expense, rate		(6.00%)	(65.00%)