Consolidated Statement of Stockholders' Equity - USD ($)	Common Stock [Member] Class A Common Stock [Member]	Common Stock [Member] Class A Common Stock [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member] Class B Common Stock [Member]	Common Stock [Member] Class B Common Stock [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Additional Paid-In Capital [Member]	Additional Paid-In Capital [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Treasury Stock [Member]	Treasury Stock [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning balance at Dec. 31, 2021	$ 287,562		$ 56,492		$ 304,889,481		$ 3,283,551		$ 263,745,358		$ (41,226,357)		$ 531,036,087
Beginning balance (in shares) at Dec. 31, 2021	28,756,203		5,649,240
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (stock compensation plans)	$ 335		$ 0		423,665		0		0		0		424,000
Issuance of common stock (stock compensation plans) (in shares)	33,407		0
Share-based compensation	$ 9		$ 0		256,451		0		0		0		256,460
Share-based compensation (in shares)	900		0
Net income (loss)	$ 0		$ 0		0		0		13,145,029		0		13,145,029
Cash dividends declared	0		0		0		0		(5,490)		0		(5,490)
Grant of stock options	0		0		98,409		0		(98,409)		0		0
Other comprehensive income (loss)	0		0		0		(20,590,225)		0		0		(20,590,225)
Ending balance at Mar. 31, 2022	$ 287,906		$ 56,492		305,668,006		(17,306,674)		276,786,488		(41,226,357)		524,265,861
Ending balance (in shares) at Mar. 31, 2022	28,790,510		5,649,240
Beginning balance at Dec. 31, 2022	$ 301,203		$ 56,492		325,601,647		(41,703,747)		240,563,774		(41,226,357)		483,593,012
Beginning balance (ASU 2016-13 [Member]) at Dec. 31, 2022		$ 0		$ 0		$ 0		$ 0		$ (1,895,902)		$ 0		$ (1,895,902)
Beginning balance (in shares) at Dec. 31, 2022	30,120,263		5,649,240
Beginning balance (in shares) (ASU 2016-13 [Member]) at Dec. 31, 2022		0		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (stock compensation plans)	$ 350		$ 0		440,746		0		0		0		441,096
Issuance of common stock (stock compensation plans) (in shares)	35,045		0
Share-based compensation	$ 1,431		$ 0		2,218,355		0		0		0		2,219,786
Share-based compensation (in shares)	143,004		0
Net income (loss)	$ 0		$ 0		0		0		5,203,596		0		5,203,596
Cash dividends declared	0		0		0		0		(7,057)		0		(7,057)
Grant of stock options	0		0		114,724		0		(114,724)		0		0
Other comprehensive income (loss)	0		0		0		4,007,638		0		0		4,007,638
Ending balance at Mar. 31, 2023	$ 302,984		$ 56,492		$ 328,375,472		$ (37,696,109)		$ 243,749,687		$ (41,226,357)		$ 493,562,169
Ending balance (in shares) at Mar. 31, 2023	30,298,312		5,649,240