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Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Schedule of Investments (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Short-term Investments	$ 5,359,719	$ 7,050,675
Long-term investments	19,445,630	19,448,519
Certificates of Deposit [Member]
Short-term Investments	417,625	1,035,827
US Treasury Securities [Member]
Long-term investments	283,126	286,015
Corporate Bond Securities [Member]
Short-term Investments	0	1,020,000
Preferred Stock [Member]
Long-term investments	104,019	104,019
U.S. Treasury Notes and Corporate Bonds [Member]
Short-term Investments	4,942,094	4,994,848
Voting Common Stock of Privately Held Company CB&T Holding Corporation [Member]
Long-term investments	$ 19,058,485	$ 19,058,485

X

- Definition

The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

+ References

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-Publisher FASB
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-Topic 210
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- Definition

Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

+ References

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