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Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Schedule of Investments (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Short-term Investments	$ 6,371,919	$ 6,251,064
Long-term investments	43,325,220	32,381,686
Certificates of Deposit [Member]
Short-term Investments	1,158,928	1,378,666
Long-term investments	687,779	317,178
US Treasury Securities [Member]
Long-term investments	1,474,937	2,902,004
U.S. Treasury Notes and Corporate Bonds [Member]
Short-term Investments	5,212,991	4,872,398
Preferred Stock [Member]
Long-term investments	104,019	104,019
Non-voting Preferred Units of DFH LLC [Member]
Long-term investments	12,000,000
Non-voting Common Units of LLC [Member]
Long-term investments	10,000,000	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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