Stock Plans and Stock Based Compensation (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
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

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.

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

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

No definition available.

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Unrecognized cost of unvested options awarded to employees as compensation.

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No definition available.

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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

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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

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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)
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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
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-SubTopic 10
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-Paragraph 2
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Net number of share options (or share units) granted during the period.

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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)
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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
-Subparagraph (a)(2)
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