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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
EARNINGS PER SHARE [Abstract] |  |
Anti-dilutive securities excluded from earnings per share calculation (in shares) | 0 | 0
Numerator [Abstract] |  |
Net earnings (loss) | $ 20,709 | $ (11,897)
Undistributed earnings (loss) | 17,391 | (15,176)
Class A [Member] |  |
Numerator [Abstract] |  |
Net earnings (loss) | 3,521 | (2,113)
Less dividends declared | 522 | 522
Undistributed earnings (loss) | $ 2,999 | $ (2,635)
Weighted average shares outstanding [Abstract] |  |
Weighted average shares outstanding (in shares) | 2,175 | 2,175
Net earnings (loss) per share [Abstract] |  |
Basic and diluted (in dollars per share) | $ 1.62 | $ (0.97)
Class B [Member] |  |
EARNINGS PER SHARE [Abstract] |  |
Dividend rate Class B common stock in excess of dividend rate of Class A common stock | 5.00% | 5.00%
Undistributed earning allocation rate of Class B common stock in excess of Class A common stock, percentage | 5.00% | 5.00%
Numerator [Abstract] |  |
Net earnings (loss) | $ 17,188 | $ (9,784)
Less dividends declared | 2,796 | 2,757
Undistributed earnings (loss) | $ 14,392 | $ (12,541)
Weighted average shares outstanding [Abstract] |  |
Weighted average shares outstanding (in shares) | 9,939 | 9,857
Net earnings (loss) per share [Abstract] |  |
Basic and diluted (in dollars per share) | $ 1.73 | $ (0.99)

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