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Stock Options, Stock Grants and New Stock (Summary of Stock Option Activity) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Outstanding, beginning of year, weighted average exercise price (dollars per share) | $ 12.25 | $ 11.95 | $ 11.82 |
Exercises, weighted average exercise price (dollars per share) | 12.47 | 11.23 | 10.69 |
Canceled / Expired, weighted average exercise price (dollars per share) | 14.08 | 13.70 | 12.70 |
Outstanding, end of year, weighted average exercise price (dollars per share) | 12.79 | $ 12.25 | $ 11.95 | $ 11.82
Exercisable, weighted average exercise price (dollars per share) | $ 11.85 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Outstanding, beginning of year (shares) | 157,295 | 162,736 | 220,740 |
Exercised (shares) | (666) | (17,074) | (15,247) |
Canceled / Expired (shares) | (15,176) | (2,157) | (83,351) |
Outstanding, end of year (shares) | 173,985 | 157,295 | 162,736 | 220,740
Exercisable (shares) | 88,025 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 1,511 | $ 91,772 | $ 64,263 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Roll Forward] |  |  |  |
Expected to vest, beginning of the year, weighted average exercise price (dollars per share) | $ 12.54 | $ 12.18 |  |
Vested, weighted average exercise price (dollars per share) | 12.16 | 11.98 |  |
Forfeited unvested options (dollars per share) | 14.23 | 13.70 |  |
Expected to vest, end of the year, weighted average exercise price (dollars per share) | $ 8.26 | $ 12.54 | $ 12.18 |
Expected to vest (shares) | 100,508 | 122,145 |  |
Vested (shares) | (35,794) | (33,702) |  |
Vested, grant date fair value (dollars per share) | $ 7.01 | $ 7.03 |  |
Forfeited unvested options (shares) | (11,286) | (1,725) |  |
Expected to vest (shares) | 85,960 | 100,508 | 122,145 |
Options outstanding, weighted average contractual term (years) | 6 years 5 months | 6 years 11 months | 7 years 6 months | 8 years 5 months
Options exercisable, weighted average contractual term (years) | 5 years 6 months |  |  |
Options expected to vest, weighted average contractual term (years) | 7 years 3 months | 7 years 2 months | 7 years 9 months |
Options outstanding, intrinsic value | $ 0 | $ 852,810 | $ 582,894 | $ 367,937
Share-based Compensation Arrangement by Share-based Payment Award, Options, Authorized | 152,028 | 169,384 | 181,017 | 138,260
Options exercisable, intrinsic value | $ 0 |  |  |
Options granted, weighted average fair value (dollars per share) | $ 6.57 | $ 6.76 | $ 7.19 |
February 7, 2013 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Granted, weighted average exercise price (dollars per share) |  |  | $ 13.70 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Granted (shares) |  |  | (40,594) |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Roll Forward] |  |  |  |
Granted, weighted average exercise price (dollars per share) |  |  | $ 13.70 |
Granted (shares) |  |  | (40,594) |
February 20, 2014 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Granted, weighted average exercise price (dollars per share) |  | $ 14.76 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Granted (shares) |  | (13,790) |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Roll Forward] |  |  |  |
Granted, weighted average exercise price (dollars per share) |  | $ 14.76 |  |
Granted (shares) |  | (13,790) |  |
Options granted, weighted average fair value (dollars per share) |  | $ 6.70 |  |
February 10, 2015 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Granted, weighted average exercise price (dollars per share) | $ 16.01 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Granted (shares) | (32,532) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Roll Forward] |  |  |  |
Granted, weighted average exercise price (dollars per share) | $ 16.01 |  |  |
Granted (shares) | (32,532) |  |  |
Options granted, weighted average fair value (dollars per share) | $ 6.39 |  |  |

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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 For presentations that combine terminations, 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 or that expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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