Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Investments available for sale:
Original or amortized cost	$ 164,891,063	$ 159,912,511
Equity securities, cost	0	35,712,633	[1]
Equity securities, cost	43,566,804	0
Trading securities, cost	0	0
Liabilities:
Trading securities, proceeds	$ 0	$ 0
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, stated value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	7,000,000	7,000,000
Common stock, outstanding (in shares)	3,318,051	3,349,927

[1] Effective January 1, 2018, the Company adopted ASU No. 2016-01 and equity securities are no longer classified as available-for-sale. Prior periods have not been restated to conform to the current presentation. See Note 2 to the Condensed Consolidated Financial Statements for additional information.