Stockholders' Equity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Weighted Average Grant Date Fair Value Per Share
Preferred stock, shares authorized	50,000
Preferred stock, par value (in dollars per share)	$ 100
Preferred stock, shares outstanding	0
Equity Incentive 2015 Plan
Weighted Average Grant Date Fair Value Per Share
Number of shares available for awards	956,088
Number of shares authorized	1,400,560
Number of additional shares available for future issuance	250,000
Restricted Stock
Number of Shares
Nonvested at the beginning of the period (in shares)	88,166
Vested, including shares withheld to cover taxes (in shares)	(61,163)
Forfeited (in shares)	(18,670)
Nonvested at the end of the period (in shares)	8,333	88,166
Weighted Average Grant Date Fair Value Per Share
Nonvested at the beginning of the period (in dollars per share)	$ 8.25
Vested, including shares withheld to cover taxes (in dollars per share)	7.96
Forfeited (in dollars per share)	7.20
Nonvested at the end of the period (in dollars per share)	$ 12.78	$ 8.25
Additional disclosures
Stock-based compensation expense	$ 1,500,000	$ 1,100,000	$ 1,100,000
Stock-based compensation costs which were capitalized	0
Unrecognized costs related to non-vested stock awards granted	$ 100,000
Restricted Stock | Minimum
Shareholders equity
Vesting period	1 year
Restricted Stock | Maximum
Shareholders equity
Vesting period	5 years
Additional disclosures
Weighted average period for recognition of unrecognized compensation costs	1 year
Restricted Stock Units RSU
Number of Shares
Nonvested at the beginning of the period (in shares)	302,113
Granted (in shares)	328,368
Vested, including shares withheld to cover taxes (in shares)	(78,947)
Forfeited (in shares)	(10,188)
Nonvested at the end of the period (in shares)	541,346	302,113
Weighted Average Grant Date Fair Value Per Share
Nonvested at the beginning of the period (in dollars per share)	$ 10.40
Granted (in dollars per share)	7.09
Vested, including shares withheld to cover taxes (in dollars per share)	10.21
Forfeited (in dollars per share)	11.18
Nonvested at the end of the period (in dollars per share)	$ 8.40	$ 10.40
Additional disclosures
Unrecognized costs related to non-vested stock awards granted	$ 2,300,000
Weighted average period for recognition of unrecognized compensation costs	1 year 9 months 18 days
Restricted Stock Units RSU | Employees | Minimum
Shareholders equity
Vesting period	3 years
Restricted Stock Units RSU | Employees | Maximum
Shareholders equity
Vesting period	5 years
restricted stock awards and units | Officers | Maximum
Shareholders equity
Vesting period	3 years
restricted stock awards and units | Directors | Minimum
Shareholders equity
Vesting period	1 year
Stock Options
Weighted Average Grant Date Fair Value Per Share
Expiration term of awards	10 years
Options Outstanding
Outstanding at the beginning of the period (in shares)	644,602
Forfeited or expired (in shares)	(38,000)
Exercised (in shares)	(39,000)
Outstanding at the end of the period (in shares)	567,602	644,602
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 5.30
Forfeited or expired (in dollars per share)	4.92
Exercised (in dollars per share)	6.67
Outstanding at the end of the period (in dollars per share)	$ 5.23	$ 5.30
Aggregate Intrinsic Value (in-the-money option)
Intrinsic value related to options outstanding	$ 2,767,532
Closing stock price (in dollars per share)	$ 9.85
Intrinsic value related to vested options outstanding	$ 2,800,000
Weighted Average Remaining Contractual Life
Weighted Average Remaining Contractual Life	4 years 4 months 28 days
Additional disclosures
Stock-based compensation expense	$ 200,000	$ 400,000	$ 600,000
Stock-based compensation costs which were capitalized	0
Unrecognized costs related to non-vested stock options awards granted	$ 200,000
Weighted average period for recognition of unrecognized compensation costs	1 year 3 months 18 days
Stock Options | Minimum
Shareholders equity
Vesting period	1 year
Stock Options | Maximum
Shareholders equity
Vesting period	5 years
Stock Options | Employees
Shareholders equity
Vesting period	5 years
Stock Options | Directors
Shareholders equity
Vesting period	1 year
Stock Options Prior to May 2008
Weighted Average Grant Date Fair Value Per Share
Expiration term of awards	5 years
Stock Options Prior to May 2008 | Employees
Shareholders equity
Vesting period	5 years
Stock Options Prior to May 2008 | Directors
Shareholders equity
Vesting period	1 year