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Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Schedule of Investments (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Short-term Investments	$ 7,294,663	$ 6,547,171
Long-term investments	19,698,400	42,638,240
Certificates of Deposit [Member]
Short-term Investments	1,022,582	987,599
Long-term investments	0	380,753
US Treasury Securities [Member]
Long-term investments	535,896	1,094,983
Corporate Bond Securities [Member]
Short-term Investments	852,000	910,000
U.S. Treasury Notes and Corporate Bonds [Member]
Short-term Investments	5,420,081	4,649,572
Preferred Stock [Member]
Long-term investments	104,019	104,019
Non-voting Preferred Units of DFH LLC [Member]
Long-term investments	0	12,000,000
Non-voting Common Units of LLC [Member]
Long-term investments	0	10,000,000
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).

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

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