Shareholders' Equity (Details) (USD $)	3 Months Ended		0 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Dec. 31, 2005
Equity Incentive 2005 Plan
Shareholders equity
Number of shares reserved for issuance but unissued				410,518
Number of shares authorized	2,710,518		2,710,518
Restricted Stock And Restricted Stock Units Member
Additional disclosures
Share-based compensation expense	$ 200,000	$ 100,000
Stock-based compensation costs which were capitalized	0
Restricted Stock
Number of Shares
Nonvested at the beginning of the period (in shares)	208,600
Vested (in shares)	(90,376)
Forfeited (in shares)	(21,724)
Nonvested at the end of the period (in shares)	96,500		96,500
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 7.52
Vested (in dollars per share)	$ 6.55
Forfeited (in dollars per share)	$ 6.55
Nonvested at the end of the period (in dollars per share)	$ 8.65		$ 8.65
Additional disclosures
Unrecognized costs related to non-vested stock awards granted	400,000		400,000
Weighted average period for recognition of unrecognized compensation costs	1 year 1 month 13 days
Restricted Stock | Minimum
Shareholders equity
Vesting period	1 year
Restricted Stock | Maximum
Shareholders equity
Vesting period	5 years
Restricted Stock Units R S U [Member]
Number of Shares
Nonvested at the beginning of the period (in shares)	144,929
Nonvested at the end of the period (in shares)	144,929		144,929
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 13.21
Nonvested at the end of the period (in dollars per share)	$ 13.21		$ 13.21
Additional disclosures
Unrecognized costs related to non-vested stock awards granted	1,200,000		1,200,000
Weighted average period for recognition of unrecognized compensation costs	2 years 3 months
Stock Options
Shareholders equity
Expiration term of awards	10 years
Vesting period	5 years
Options Outstanding
Outstanding at the beginning of the period (in shares)	732,852		719,852
Exercised (in shares)	(13,000)
Outstanding at the end of the period (in shares)	719,852		719,852
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 5.27		$ 5.30
Exercised (in dollars per share)	$ 3.70
Outstanding at the end of the period (in dollars per share)	$ 5.30		$ 5.30
Aggregate Intrinsic Value (in-the-money option)
Intrinsic value related to options outstanding	4,229,251		4,229,251
Closing stock price (in dollars per share)	$ 11.05		$ 11.05
Intrinsic value related to vested options outstanding	2,800,000		2,800,000
Weighted Average Remaining Contractual Life
Weighted Average Remaining Contractual Life			6 years 3 months 18 days
Additional disclosures
Share-based compensation expense	100,000	100,000
Weighted average period for recognition of unrecognized compensation costs	2 years 2 months 12 days
Unrecognized costs related to non-vested stock options awards granted	$ 800,000		$ 800,000
Stock Options | Minimum
Shareholders equity
Vesting period	1 year
Stock Options | Maximum
Shareholders equity
Vesting period	5 years