Investments (Narrative) (Details) - USD ($)	Mar. 31, 2023	Mar. 09, 2023	Dec. 31, 2022		Sep. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investments		$ 21,500,000
Short-term investments	$ 25,635,492		$ 23,007,385	[1]
Long-term investments	229,398,824		202,331,983	[1]
Adasky, LTD
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investment, ownership percentage		15.00%
Long-term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, FV-NI	86,900,000		69,500,000
Long-term investments					$ 84,700,000	$ 65,700,000
Short-Term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 2,200,000		$ 3,800,000
Minimum | Gentex Corporation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investment, ownership percentage	20.00%
Maximum | Gentex Corporation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investment, ownership percentage	50.00%

[1] The condensed consolidated balance sheet at December 31, 2022 has been derived from the audited consolidated financial statements at that date, but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.