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Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Schedule of Investments (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Short-term Investments	$ 7,785,796	$ 6,547,171
Long-term investments	25,915,835	42,638,240
Certificates of Deposit [Member]
Short-term Investments	994,441	987,599
Long-term investments	106,215	380,753
US Treasury Securities [Member]
Long-term investments	647,116	1,094,983
Corporate Bond Securities [Member]
Short-term Investments	807,000	910,000
U.S. Treasury Notes and Corporate Bonds [Member]
Short-term Investments	5,984,355	4,649,572
Preferred Stock [Member]
Long-term investments	104,019	104,019
Non-voting Preferred Units of DFH LLC [Member]
Long-term investments	6,000,000	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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