Note I - Income Taxes - Deferred Taxes Included in Other Assets (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2014
Allowance for loan losses	$ 883,000	$ 1,121,000
Employee benefit plans' liabilities	3,189,000	3,117,000
Unrealized loss on available for sale securities, charged from equity		973,000
Loss on credit impairment of securities	356,000	356,000
Earned retiree health benefits plan liability	1,049,000	1,048,000
General business and AMT credits	1,707,000	1,750,000
Tax net operating loss carryforward	2,048,000	2,118,000
Other	863,000	943,000
Valuation allowance	(7,099,000)	(8,642,000)	$ (8,140,000)
Deferred tax assets	2,996,000	2,784,000
Unrealized gain on available for sale securities, charged from equity	342,000
Unearned retiree health benefits plan asset	381,000	298,000
Bank premises and equipment	2,047,000	2,235,000
Other	226,000	251,000
Deferred tax liabilities	2,996,000	2,784,000
Net deferred taxes	$ 0	$ 0