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Incentive Plans (Details) - USD ($) |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 02, 2014 | Feb. 13, 2013 | Mar. 07, 2012 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2010 | Nov. 30, 2010 | May 03, 2005 | Dec. 31, 1993
Stock Options |  |  |  |  |  |  |  |  |
Incentive plans |  |  |  |  |  |  |  |  |
Compensation expense |  |  |  | $ 994 | $ 3,309 |  |  |  |
Unrecognized compensation related to unvested awards |  |  |  | $ 0 |  |  |  |  |
Options |  |  |  |  |  |  |  |  |
Balance at the beginning of the period(in shares) |  |  |  | 139,750 |  |  |  |  |
Granted (in shares) |  |  |  | 0 |  |  |  |  |
Exercised (in shares) |  |  |  | (1,507) |  |  |  |  |
Cancelled (in shares) |  |  |  | (100,493) |  |  |  |  |
Balance at the end of the period (in shares) |  |  |  | 37,750 | 139,750 |  |  |  |
Exercisable at the end of the period (in shares) |  |  |  | 37,750 |  |  |  |  |
Weighted-Average Exercise Price Per Share |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  |  | $ 6.66 |  |  |  |  |
Exercised (in dollars per share) |  |  |  | 3.20 |  |  |  |  |
Cancelled (in dollars per share) |  |  |  | 7.43 |  |  |  |  |
Outstanding at the end of the period (in dollars per share) |  |  |  | 4.75 | $ 6.66 |  |  |  |
Exercisable at the end of the period (in dollars per share) |  |  |  | $ 4.75 |  |  |  |  |
Weighted-Average Remaining Contractual Term |  |  |  |  |  |  |  |  |
Outstanding at the end of the period |  |  |  | 4 years 2 months 16 days |  |  |  |  |
Exercisable at the end of the period |  |  |  | 4 years 2 months 16 days |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |
Outstanding at the end of the period |  |  |  | $ 10,005 |  |  |  |  |
Exercisable at the end of the period |  |  |  | 10,005 |  |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |
Intrinsic value of options exercised |  |  |  | 964 | $ 8,166 |  |  |  |
Cash received from options exercised |  |  |  | $ 4,822 | $ 10,666 |  |  |  |
Stock Options | Minimum |  |  |  |  |  |  |  |  |
Incentive plans |  |  |  |  |  |  |  |  |
Exercisable period |  |  |  | 1 year |  |  |  |  |
Stock Options | Maximum |  |  |  |  |  |  |  |  |
Incentive plans |  |  |  |  |  |  |  |  |
Expiration term |  |  |  | 10 years |  |  |  |  |
1993 Plan |  |  |  |  |  |  |  |  |
Incentive plans |  |  |  |  |  |  |  |  |
Number of common shares authorized |  |  |  |  |  |  |  |  | 50,000
Purchase price as a percentage of market value |  |  |  | 90.00% |  |  |  |  |
Common shares issued |  |  |  | 22,118 | 0 |  |  |  |
2003 Plan | Stock Options |  |  |  |  |  |  |  |  |
Incentive plans |  |  |  |  |  |  |  |  |
Number of shares eliminated |  |  |  |  |  |  |  | 172,500 |
2005 Plan | Stock Options |  |  |  |  |  |  |  |  |
Incentive plans |  |  |  |  |  |  |  |  |
Shares available for grant |  |  |  | 0 |  |  |  | 200,000 |
2005 Plan | Stock Options | Minimum |  |  |  |  |  |  |  |  |
Incentive plans |  |  |  |  |  |  |  |  |
Purchase price as a percentage of market value |  |  |  | 100.00% |  |  |  |  |
2010 Plan | Equity Appreciation Rights Plan |  |  |  |  |  |  |  |  |
Incentive plans |  |  |  |  |  |  |  |  |
Compensation income |  |  |  | $ 37,000 | $ 69,000 |  |  |  |
Equity Appreciation Rights Plan |  |  |  |  |  |  |  |  |
Vesting period from the base date |  |  |  | 3 years |  |  |  |  |
Shares issued (in units) |  |  |  |  |  | 100,000 |  |  |
Shares granted (in units) | 50,000 | 350,000 | 250,000 | 31,666 | 52,500 |  |  |  |
Accrued compensation included in other accrued liabilities |  |  |  | $ 23,000 | $ 61,000 |  |  |  |
Accrued compensation included in other long-term liabilities |  |  |  | 22,000 | 82,000 |  |  |  |
Accrued compensation liability |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 143,000 | 259,000 |  |  |  |
Reductions |  |  |  | (36,000) | (69,000) |  |  |  |
Payments |  |  |  | (62,000) | (47,000) |  |  |  |
Ending Balance |  |  |  | 45,000 | 143,000 |  |  |  |
Accrued compensation liability |  |  |  |  |  |  |  |  |
Compensation liability included in other accrued liabilities |  |  |  | 23,000 | 61,000 |  |  |  |
Accrued compensation included in other long-term liabilities |  |  |  | $ 22,000 | $ 82,000 |  |  |  |
2010 Plan | Equity Appreciation Rights Plan | Maximum |  |  |  |  |  |  |  |  |
Incentive plans |  |  |  |  |  |  |  |  |
Number of common shares authorized |  |  |  |  |  |  | 1,000,000 |  |
Equity Appreciation Rights Plan |  |  |  |  |  |  |  |  |
Redemption cash payment period |  |  |  | 90 days |  |  |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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