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Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Schedule of Investments (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Short-term Investments	$ 4,856,131	$ 1,659,299
Long-term investments	32,177,419	13,901,281
Certificates of Deposit [Member]
Short-term Investments	816,709	746,219
Long-term investments	931,291	1,080,426
US Treasury Securities [Member]
Long-term investments	2,083,624	2,820,855
U.S. Treasury Notes and Corporate Bonds [Member]
Short-term Investments	4,039,422	809,184
Convertible Debt Securities [Member]
Short-term Investments		103,896
Preferred Stock [Member]
Long-term investments	104,019
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

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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