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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Numerator [Abstract] |  |  |  |
Net earnings | $ 2,967 | $ 6,634 | $ 4,098 | $ 5,332
Undistributed earnings | 2,132 | 5,814 | 2,425 | 3,681
Class A [Member] |  |  |  |
Numerator [Abstract] |  |  |  |
Net earnings | 494 | 1,141 | 673 | 901
Less dividends declared | 131 | 131 | 261 | 261
Undistributed earnings | $ 363 | $ 1,010 | $ 412 | $ 640
Weighted-average shares outstanding [Abstract] |  |  |  |
Basic and diluted (in shares) | 2,175 | 2,175 | 2,175 | 2,175
Net earnings per share [Abstract] |  |  |  |
Basic and diluted (in dollars per share) | $ 0.23 | $ 0.52 | $ 0.31 | $ 0.41
Class B [Member] |  |  |  |
Numerator [Abstract] |  |  |  |
Net earnings | $ 2,473 | $ 5,493 | $ 3,425 | $ 4,431
Less dividends declared | 704 | 689 | 1,412 | 1,390
Undistributed earnings | $ 1,769 | $ 4,804 | $ 2,013 | $ 3,041
Weighted-average shares outstanding [Abstract] |  |  |  |
Basic and diluted (in shares) | 10,112 | 9,844 | 10,100 | 9,850
Net earnings per share [Abstract] |  |  |  |
Basic and diluted (in dollars per share) | $ 0.24 | $ 0.56 | $ 0.34 | $ 0.45

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