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NET INCOME PER COMMON SHARE AND EQUITY PER COMMON SHARE (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Shares used in computing basic and diluted net income per share [Abstract] |  |  |
Weighted average common shares outstanding during the period for Basic computation (in shares) | 9,462,000 | 9,394,000 | 9,327,000
Dilutive effect of employee stock options and awards (in shares) | 19,000 | 32,000 | 42,000
Weighted average common shares outstanding during the period for Diluted computation (in shares) | 9,481,000 | 9,426,000 | 9,369,000
Earnings Per Share [Abstract] |  |  |
Equity per common share (in dollars per share) | $ 1.9 | $ 1.79 | $ 1.8
Common Stock [Member] |  |  |
Earnings Per Share [Abstract] |  |  |
Equity per common share (in dollars per share) | $ 19.86 | $ 18.94 | $ 18.16
Common Stock [Member] | Class A Stock [Member] |  |  |
Common Stock [Abstract] |  |  |
Common stock, shares authorized (in shares) | 15,000,000 | 15,000,000 | 15,000,000
Common stock, shares issued (in shares) | 8,621,415 | 8,532,795 | 8,475,452
Common stock, shares outstanding (in shares) | 8,621,415 | 8,532,795 | 8,475,452
Common stock, par value (in dollars per share) | $ 1 |  |
Common Stock [Member] | Class B Stock [Member] |  |  |
Common Stock [Abstract] |  |  |
Common stock, shares authorized (in shares) | 1,040,000 | 1,040,000 | 1,040,000
Common stock, shares issued (in shares) | 881,452 | 881,452 | 881,452
Common stock, shares outstanding (in shares) | 881,452 | 881,452 | 881,452
Common stock, par value (in dollars per share) | $ 1 |  |
Stock Option [Member] |  |  |
Common Stock [Abstract] |  |  |
Shares excluded from calculations of diluted net income per share (in shares) | 0 | 0 | 0
Restricted Stock [Member] |  |  |
Common Stock [Abstract] |  |  |
Shares excluded from calculations of diluted net income per share (in shares) | 0 | 0 | 0

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (excludes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding. + References No definition available. + Details
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