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Stock Plans and Stock Based Compensation (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Awards granted (in shares) | 73,716 | 109,750 | 186,982
Stock-based compensation expense | $ 2,270 | $ 1,903 | $ 1,506
2009 Equity Plan |  |  |
Authorized number of awards (in shares) | 1,602,000 |  |
Employee Stock Option | 2009 Equity Plan |  |  |
Award term (no more than) | 10 years |  |
Restricted Stock Units (RSUs) |  |  |
Awards granted (in shares) | 53,770 | 61,235 | 101,100
Average grant date fair value (in USD per share) | $ 76.93 | $ 56.29 | $ 49.22
Stock-based compensation expense | $ 1,800 | $ 1,400 | $ 771
Unrecognized compensation cost - RSUs | $ 11,000 |  |
Period for recognization - unrecognized compensation cost (in shares) | 4 years 9 months |  |
Stock Appreciation Rights (SARs) |  |  |
Awards granted (in shares) | 19,946 | 48,515 | 81,495
Stock Appreciation Rights (SARs) | 2009 Equity Plan |  |  |
Award term (no more than) | 10 years |  |
Stock Options |  |  |
Awards granted (in shares) |  |  | 4,387
Stock-based compensation expense | $ 476 | $ 509 | $ 734
Unrecognized compensation cost - options | $ 1,300 |  |
Period for recognization - unrecognized compensation cost (in shares) | 4 years 5 months |  |
Minimum | Employee Stock Option | 2009 Equity Plan |  |  |
Award vesting period (in years) | 1 year |  |
Minimum | Restricted Stock | 2009 Equity Plan |  |  |
Award vesting period (in years) | 1 year |  |
Minimum | Stock Appreciation Rights (SARs) | 2009 Equity Plan |  |  |
Award vesting period (in years) | 1 year |  |
Maximum | Employee Stock Option | 2009 Equity Plan |  |  |
Award vesting period (in years) | 7 years |  |
Maximum | Restricted Stock | 2009 Equity Plan |  |  |
Award vesting period (in years) | 7 years |  |
Maximum | Stock Appreciation Rights (SARs) | 2009 Equity Plan |  |  |
Award vesting period (in years) | 7 years |  |

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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=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References No definition available. + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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