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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, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Numerator [Abstract] |  |  |  |
Net earnings available to common stockholders | $ 6,062 | $ 3,065 | $ 11,382 | $ 5,568
Undistributed earnings | 5,250 | 2,281 | 9,761 | 4,000
Undistributed earnings allocation - basic and diluted [Abstract] |  |  |  |
Total undistributed earnings | 5,250 | 2,281 | 9,761 | 4,000
Net earnings allocation - basic and diluted [Abstract] |  |  |  |
Net earnings available to common stockholders | 6,062 | 3,065 | 11,382 | 5,568
Class A [Member] |  |  |  |
Numerator [Abstract] |  |  |  |
Net earnings available to common stockholders | 1,054 | 545 | 1,981 | 987
Less Dividends declared: | 130 | 131 | 261 | 261
Undistributed earnings allocation - basic and diluted [Abstract] |  |  |  |
Total undistributed earnings | 924 | 414 | 1,720 | 726
Net earnings allocation - basic and diluted [Abstract] |  |  |  |
Net earnings available to common stockholders | $ 1,054 | $ 545 | $ 1,981 | $ 987
Weighted-average shares outstanding [Abstract] |  |  |  |
Common share - basic and diluted (in shares) | 2,175 | 2,175 | 2,175 | 2,175
Net earnings per share [Abstract] |  |  |  |
Common share - basic and diluted (in dollars per share) | $ 0.49 | $ 0.25 | $ 0.91 | $ 0.45
Class B [Member] |  |  |  |
Numerator [Abstract] |  |  |  |
Net earnings available to common stockholders | $ 5,008 | $ 2,520 | $ 9,401 | $ 4,581
Less Dividends declared: | 682 | 653 | 1,360 | 1,307
Undistributed earnings allocation - basic and diluted [Abstract] |  |  |  |
Total undistributed earnings | 4,326 | 1,867 | 8,041 | 3,274
Net earnings allocation - basic and diluted [Abstract] |  |  |  |
Net earnings available to common stockholders | $ 5,008 | $ 2,520 | $ 9,401 | $ 4,581
Weighted-average shares outstanding [Abstract] |  |  |  |
Common share - basic and diluted (in shares) | 9,693 | 9,332 | 9,682 | 9,333
Net earnings per share [Abstract] |  |  |  |
Common share - basic and diluted (in dollars per share) | $ 0.52 | $ 0.27 | $ 0.97 | $ 0.49

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