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NET INCOME PER COMMON SHARE AND EQUITY PER COMMON SHARE (Details) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
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) | 9,223,000 | 9,135,000 |
Dilutive effect of employee stock options and awards (in shares) | 58,000 | 69,000 |
Weighted average common shares outstanding during the period for Diluted computation (in shares) | 9,281,000 | 9,204,000 |
Class A Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common stock, shares authorized (in shares) | 15,000,000 |  |
Common stock, shares issued (in shares) | 8,348,243 | 8,263,579 |
Common stock, shares outstanding (in shares) | 8,348,243 | 8,263,579 |
Common stock, par value (in dollars per share) | $ 1.00 |  |
Common stock, shares issued during period (in shares) | 14,789 | 17,565 |
Equity per common share (in dollars per share) | $ 16.09 |  | $ 15.98
Class B Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common stock, shares authorized (in shares) | 1,040,000 |  |
Common stock, shares issued (in shares) | 881,452 | 881,452 |
Common stock, shares outstanding (in shares) | 881,452 | 881,452 |
Common stock, par value (in dollars per share) | $ 1.00 |  |
Restricted Stock [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Shares excluded from calculations of diluted net income per share (in shares) | 0 |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes 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 and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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