Note B - Securities (Details Textual)	12 Months Ended
Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Proceeds from Sale of Debt Securities, Available-for-sale	$ 15,123,868	$ 0	$ 30,748,797
Debt and Equity Securities, Realized Gain (Loss), Total	146,675		133,986
Proceeds from Sale of Other Investments		125,145
Gain (Loss) on Sale of Other Investments		16,995
Security Owned and Pledged as Collateral, Fair Value, Total	$ 230,065,621	$ 208,781,426
US Treasury Securities [Member]
Securities In Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	11
Securities, Qualitative Disclosure, Number of Positions	12
US Government Agencies Debt Securities [Member]
Securities In Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	2
Securities, Qualitative Disclosure, Number of Positions	4
Collateralized Mortgage Backed Securities [Member]
Securities In Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	6
Securities, Qualitative Disclosure, Number of Positions	47
Collateralized Mortgage Obligations [Member]
Securities In Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	2
Securities, Qualitative Disclosure, Number of Positions	3
US States and Political Subdivisions Debt Securities [Member]
Securities In Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	16
Securities, Qualitative Disclosure, Number of Positions	131

Number of investments in securities in unrealized loss position, without allowance for credit loss.

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Number of investments in securities without allowance for credit loss.

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Amount of realized gain (loss) on investment in debt and equity securities.

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Amount of gain (loss) included in earnings for investments classified as other.

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash inflow from the sale of investments classified as other.

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Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

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