Note B - Marketable Securities - Summary of Investments (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Debt securities, cost	$ 3,481,625	$ 3,742,681
Debt securities	3,481,625	3,742,681
Debt securities, unrealized gain
Equity securities, cost	2,964,651	3,626,952
Equity securities	3,385,891	3,879,515
Marketable securities, unrealized (loss) gain	421,240	252,563
Marketable securities, cost	6,446,276	7,369,633
Marketable securities	6,867,516	7,622,196
US Treasury Securities [Member]
Debt securities, cost	3,481,625	3,742,681
Debt securities	3,481,625	3,742,681
Debt securities, unrealized gain
Fixed Income Securities [Member]
Equity securities, cost	1,940,071	2,408,799
Equity securities	2,122,157	2,409,213
Equity securities, unrealized gain	182,086	414
Equity And Other Mutual Funds [Member]
Equity securities, cost	1,024,580	1,218,153
Equity securities	1,263,734	1,470,302
Equity securities, unrealized gain	$ 239,154	$ 252,149

Cost of investment in debt securities classified as held to maturity and equity securities.

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Fair value of investment in debt securities classified as held to maturity and equity securities.

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Amount of accumulated unrealized gain (loss) in debt securities classified as held to maturity and equity securities.

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Accumulated amount of unrealized gain (loss) on equity securities.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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 investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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