Investments - Schedule of Major Security Type (Details) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Marketable Securities [Line Items]
Debt Securities, Amortized Cost/Cost	$ 81,999,373	$ 86,763,654
Debt Securities, Gross Unrealized Gains	614,154	221,846
Debt Securities, Gross Unrealized Losses	532,070	1,778,831
Debt Securities, Fair Value	82,081,457	85,206,669
Equity Securities, Fair Value	8,057,004	7,267,094
Amortized Cost/Cost	89,604,381	94,332,464
Gross Unrealized Gains	1,583,319	746,372
Gross Unrealized Losses	1,049,239	2,605,073
Fair Value	90,138,461	92,473,763
Industrial and miscellaneous [Member]
Marketable Securities [Line Items]
Debt Securities, Amortized Cost/Cost	55,206,618	59,561,984
Debt Securities, Gross Unrealized Gains	258,117	14,030
Debt Securities, Gross Unrealized Losses	367,125	1,524,644
Debt Securities, Fair Value	55,097,610	58,051,370
U.S. government [Member]
Marketable Securities [Line Items]
Debt Securities, Amortized Cost/Cost	12,495,670	12,859,101
Debt Securities, Gross Unrealized Gains	66,357	87,354
Debt Securities, Gross Unrealized Losses	143,202	208,699
Debt Securities, Fair Value	12,418,825	12,737,756
States, territories, and possessions [Member]
Marketable Securities [Line Items]
Debt Securities, Amortized Cost/Cost	1,108,127	1,111,879
Debt Securities, Gross Unrealized Gains	32,091	14,497
Debt Securities, Gross Unrealized Losses		897
Debt Securities, Fair Value	1,140,218	1,125,479
Subdivisions of states, territories, and possessions [Member]
Marketable Securities [Line Items]
Debt Securities, Amortized Cost/Cost	13,188,958	13,230,690
Debt Securities, Gross Unrealized Gains	257,589	105,965
Debt Securities, Gross Unrealized Losses	21,743	44,591
Debt Securities, Fair Value	13,424,804	13,292,064
Common stock [Member]
Marketable Securities [Line Items]
Equity Securities, Amortized Cost/Cost	7,605,008	7,568,810
Equity Securities, Gross Unrealized Gains	969,165	524,526
Equity Securities, Gross Unrealized Losses	517,169	826,242
Equity Securities, Fair Value	$ 8,057,004	$ 7,267,094

Marketable securities unrealized gains.

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Marketable securities unrealized losses.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Cost of the investment.

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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