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Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Schedule of Investments (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Short-term Investments	$ 9,162,641	$ 6,251,064
Long-term investments	32,692,006	32,381,686
Certificates of Deposit [Member]
Short-term Investments	1,189,539	1,378,666
Long-term investments		317,178
US Treasury Securities [Member]
Long-term investments	3,530,646	2,902,004
U.S. Treasury Notes and Corporate Bonds [Member]
Short-term Investments	7,973,102	4,872,398
Preferred Stock [Member]
Long-term investments	104,019	104,019
Non-voting Common Units of LLC [Member]
Long-term investments	9,998,856	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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