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Consolidated Statements of Stockholders' Equity - USD ($)
Common Stock [Member]
Class A Common Stock [Member]
Common Stock [Member]
Class B Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Total
Beginning balance at Dec. 31, 2019 $ 262,040 $ 56,492 $ 268,151,601 $ 504,170 $ 223,267,573 $ (41,226,357) $ 451,015,519
Beginning balance (in shares) at Dec. 31, 2019 26,203,935 5,649,240          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock (stock compensation plans) $ 1,532   2,057,504       2,059,036
Issuance of common stock (stock compensation plans) (in shares) 153,233            
Stock-based compensation $ 12,946   18,582,085       18,595,031
Stock-based compensation (in shares) 1,294,606            
Net income (loss)         52,815,252   52,815,252
Cash dividends         (17,337,160)   (17,337,160)
Grant of stock options     358,377   (358,377)   0
Other comprehensive income (loss)       10,626,442     10,626,442
Ending balance at Dec. 31, 2020 $ 276,518 $ 56,492 289,149,567 11,130,612 258,387,288 (41,226,357) 517,774,120
Ending balance (in shares) at Dec. 31, 2020 27,651,774 5,649,240          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock (stock compensation plans) $ 1,578   2,161,142       2,162,720
Issuance of common stock (stock compensation plans) (in shares) 157,783            
Stock-based compensation $ 9,466   13,260,855       13,270,321
Stock-based compensation (in shares) 946,646            
Net income (loss)         25,254,174   25,254,174
Cash dividends         (19,578,187)   (19,578,187)
Grant of stock options     317,917   (317,917)   0
Other comprehensive income (loss)       (7,847,061)     (7,847,061)
Ending balance at Dec. 31, 2021 $ 287,562 $ 56,492 304,889,481 3,283,551 263,745,358 (41,226,357) 531,036,087
Ending 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) $ 1,613   2,122,277       2,123,890
Issuance of common stock (stock compensation plans) (in shares) 161,254            
Stock-based compensation $ 12,028   18,252,148       18,264,176
Stock-based compensation (in shares) 1,202,806            
Net income (loss)         (1,959,405)   (1,959,405)
Cash dividends         (20,884,438)   (20,884,438)
Grant of stock options     337,741   (337,741)   0
Other comprehensive income (loss)       (44,987,298)     (44,987,298)
Ending balance at Dec. 31, 2022 $ 301,203 $ 56,492 $ 325,601,647 $ (41,703,747) $ 240,563,774 $ (41,226,357) $ 483,593,012
Ending balance (in shares) at Dec. 31, 2022 30,120,263 5,649,240