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9. Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Jan. 01, 2018
Effective tax rate	23.00%	28.00%	23.00%	24.00%
Unrealized Gain on Securities	$ 318,007	$ 0	$ 1,420,339	$ 0
Tax Cuts and Jobs Act, Incomplete Accounting, Provisional Income Tax Expense (Benefit)					$ 55,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	3,000		3,000
U.S. Federal [Member]
Statutory Rates				35.00%
Adjustments for New Accounting Pronouncement [Member]
Unrealized Gain on Securities	318,000		1,420,300
Deferred Income Tax Assets, Net						$ 232,900
Deferred Income Tax Expense (Benefit)	$ 70,000		$ 313,700
Federal and State [Member]
Effective tax rate	22.00%		22.00%

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