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Stock Based Compensation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock based compensation:
Employee Service Shared-based Compensation, Tax Benefit from Compensation Expense, Restricted Stock	$ 33,000	$ (126,000)	$ 0
2006 Plan
Stock based compensation:
Number of shares authorized for grant	3,000,000
Shares Remaining for Issuance	1,078,671
Restricted Stock [Member]
Restricted stock, nonvested:
Restricted stock, nonvested, beginning of year (in shares)	141,095	158,261	112,907
Restricted stock, grants in period (in shares)	315,429	84,643	122,963
Restricted stock, vested in period (in shares)	(82,067)	(95,717)	(49,183)
Restricted stock, forfeitures in period (in shares)	(24,572)	(6,092)	(28,426)
Restricted stock, nonvested, end of year (in shares)	349,885	141,095	158,261
Restricted stock, weighted average grant date fair value:
Restricted stock, nonvested, weighted average grant date fair value, beginning of period (USD per share)	$ 16.79	$ 14.55	$ 16.86
Restricted stock, grants in period, weighted average grant date fair value (USD per share)	11.32	19.17	12.59
Restricted stock, vested in period, weighted average grant date fair value (USD per share)	16.57	15.25	14.16
Restricted stock, forfeitures in period, weighted average grant date fair value (USD per share)	16.91	17.93	15.93
Restricted stock, nonvested, weighted average grant date fair value, end of period (USD per share)	$ 10.62	$ 16.79	$ 14.55
Total unrecognized compensation expense	$ 2,598,000	$ 1,601,000
Weighted average period for recognition of compensation expense	1 year 8 months
Shares Paid for Tax Withholding for Share Based Compensation	17,180	19,533	10,590
Restricted Stock [Member] | 2006 Plan
Stock based compensation:
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Restricted Stock [Member] | Selling, General and Administrative Expenses [Member]
Stock based compensation:
Stock based compensation expense	$ 1,774,000	$ 1,331,000	$ 1,003,000
Equity [Member]
Stock based compensation:
Employee Service Shared-based Compensation, Tax Benefit from Compensation Expense, Restricted Stock			$ (16,000)

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Employee Service Shared-based Compensation, Tax Benefit from Compensation Expense, Restricted Stock

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Unrecognized cost of unvested share-based compensation awards.

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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).

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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