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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator [Abstract]
Net earnings	$ 6,634	$ 3,120	$ 5,332	$ 3,866
Undistributed earnings	5,815	2,300	3,682	2,217
Class A [Member]
Numerator [Abstract]
Net earnings	1,141	530	901	646
Less dividends declared	130	131	261	261
Undistributed earnings	$ 1,011	$ 399	$ 640	$ 385
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)	$ 0.52	$ 0.24	$ 0.41	$ 0.30
Class B [Member]
Numerator [Abstract]
Net earnings	$ 5,493	$ 2,590	$ 4,431	$ 3,220
Less dividends declared	689	689	1,389	1,388
Undistributed earnings	$ 4,804	$ 1,901	$ 3,042	$ 1,832
Weighted-average shares outstanding [Abstract]
Basic and diluted (in shares)	9,844	9,859	9,850	9,852
Net earnings per share [Abstract]
Basic and diluted (in dollars per share)	$ 0.56	$ 0.26	$ 0.45	$ 0.33

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed.

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