Shareholders' Equity (Details 2) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 26, 2015 USD ($) $ / shares shares
Shareholders' Equity
Options Outstanding (in shares) | shares	645,652
Weighted Average Remaining Contractual Life	5 years 9 months 18 days
Weighted Average Exercise Price (in dollars per share)	$ 5.30
Options Exercisable (in shares) | shares	457,252
Weighted Average Exercise Price (in dollars per share)	$ 4.57
Expiration term of awards	10 years
Stock Options
Aggregate Intrinsic Value (in-the-money option)
Intrinsic value related to vested options outstanding | $	$ 2.1
Stock Options | Exercise Price Range From Dollars 1.70 to Dollars 2.40
Shareholders' Equity
Exercise price, low end of range (in dollars per share)	$ 1.70
Exercise price, high end of range (in dollars per share)	$ 2.40
Options Outstanding (in shares) | shares	173,600
Weighted Average Remaining Contractual Life	3 years 2 months 12 days
Weighted Average Exercise Price (in dollars per share)	$ 1.88
Options Exercisable (in shares) | shares	173,600
Weighted Average Exercise Price (in dollars per share)	$ 1.88
Stock Options | Exercise Price Range From Dollars 3.20 to Dollars 6.55
Shareholders' Equity
Exercise price, low end of range (in dollars per share)	3.20
Exercise price, high end of range (in dollars per share)	$ 6.55
Options Outstanding (in shares) | shares	271,600
Weighted Average Remaining Contractual Life	5 years 10 months 24 days
Weighted Average Exercise Price (in dollars per share)	$ 5.05
Options Exercisable (in shares) | shares	187,500
Weighted Average Exercise Price (in dollars per share)	$ 4.84
Stock Options | Exercise Price Range From Dollars 7.21 to Dollars 12.78
Shareholders' Equity
Exercise price, low end of range (in dollars per share)	7.21
Exercise price, high end of range (in dollars per share)	$ 12.78
Options Outstanding (in shares) | shares	178,800
Weighted Average Remaining Contractual Life	7 years 9 months 18 days
Weighted Average Exercise Price (in dollars per share)	$ 8.03
Options Exercisable (in shares) | shares	74,500
Weighted Average Exercise Price (in dollars per share)	$ 7.68
Stock Options | Exercise Price Range From Dollars 13.21 to Dollars 13.21
Shareholders' Equity
Exercise price, low end of range (in dollars per share)	13.21
Exercise price, high end of range (in dollars per share)	$ 13.21
Options Outstanding (in shares) | shares	21,652
Weighted Average Remaining Contractual Life	8 years 8 months 12 days
Weighted Average Exercise Price (in dollars per share)	$ 13.21
Options Exercisable (in shares) | shares	21,652
Weighted Average Exercise Price (in dollars per share)	$ 13.21
Minimum
Shareholders' Equity
Vesting period	3 years
Minimum | Stock Options
Shareholders' Equity
Vesting period	1 year
Maximum
Shareholders' Equity
Vesting period	5 years
Maximum | Stock Options
Shareholders' Equity
Vesting period	5 years