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STOCK OPTION ROLLFORWARD (Details 5) - Stock options [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stock Option Awards, Outstanding (in shares): |  |  |  |  |
Balance outstanding at beginning of period |  | 109,650 |  |  |
Granted |  | 5,000 |  |  |
Exercised |  | (30,150) |  |  |
Forfeited |  | 0 |  |  |
Expired |  | (500) |  |  |
Balance outstanding at end of period |  | 84,000 | [1] | 109,650 |
Options outstanding and expected to vest at December 31, 2017 | [2] | 84,000 |  |  |
Options exercisable at December 31, 2017 | [3] | 79,001 |  |  |
Weighted Average Exercise Price, Outstanding (in usd per share): |  |  |  |  |
Balance outstanding at beginning of period |  | $ 29.93 |  |  |
Granted |  | 70.28 |  |  |
Exercised |  | 30.43 |  |  |
Forfeited |  | 0.00 |  |  |
Expired |  | 28.88 |  |  |
Balance outstanding at end of period |  | 32.16 |  | $ 29.93 |
Options outstanding and expected to vest at December 31, 2017 |  | 32.16 |  |  |
Options exercisable at December 31, 2017 |  | $ 30.21 |  |  |
Balance at December 31, 2016, Weighted average remaining contractual term (years) |  | 3 years 16 days |  |  |
Options outstanding and expected to vest at December 31, 2016, Weighted Average Remaining Contractual Term (years) |  | 3 years 16 days |  |  |
Options exercisable at December 31, 2016, Weighted Average Remaining Contractual Term (years) |  | 2 years 7 months 20 days |  |  |
Balance at December 31, 2016, Aggregate Intrinsic Value | [4] | $ 3,258 |  |  |
Options outstanding and expected to vest at December 31, 2016, Aggregate Intrinsic Value | [4] | 3,258 |  |  |
Options exercisable at December 31, 2016, Aggregate Intrinsic Value | [4] | $ 3,218 |  |  |
Stock Option Awards, Nonvested (in shares) |  |  |  |  |
Balance nonvested at beginning of period |  | 6,666 |  |  |
Granted |  | 5,000 |  |  |
Vested |  | (6,667) |  |  |
Forfeited |  | 0 |  |  |
Expired |  | 0 |  |  |
Balance nonvested at end of period |  | 4,999 |  | 6,666 |
Weighted Average Grant Date Fair Value, Nonvested (in dollars per share): |  |  |  |  |
Balance nonvested at beginning of period |  | $ 11.03 |  |  |
Granted |  | 12.43 |  | $ 11.03 | $ 0.00
Vested |  | 10.85 |  |  |
Forfeited |  | 0.00 |  |  |
Expired |  | 0 |  |  |
Balance nonvested at end of period |  | $ 12.11 |  | $ 11.03 |
Unrecognized compensation cost |  | $ 22 |  |  |
Weighted average remaining recognition period (years) |  | 1 year |  |  |
[1] | Inclusive of 38,000 stock options outstanding to Directors.
[2] | Inclusive of 38,000 vested stock options and expected to vest to Directors.
[3] | Inclusive of 33,001 vested stock options outstanding to Directors.
[4] | The aggregate intrinsic value in the preceding tables represents the total pre-tax intrinsic value, based on the average of the high price and low price at which the Company’s common stock traded on December 31, 2017 of $70.95, which would have been received by the option holders had they all exercised their options as of that date.

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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