Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Unaudited) (Quarterly Financial Data)(Details)

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Quarterly Financial Data (Unaudited) (Quarterly Financial Data)(Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 28, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Dec. 29, 2013
Sep. 29, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 61,759us-gaap_SalesRevenueNet $ 64,107us-gaap_SalesRevenueNet $ 63,284us-gaap_SalesRevenueNet $ 55,951us-gaap_SalesRevenueNet $ 50,760us-gaap_SalesRevenueNet $ 53,476us-gaap_SalesRevenueNet $ 53,427us-gaap_SalesRevenueNet $ 46,698us-gaap_SalesRevenueNet $ 245,101us-gaap_SalesRevenueNet $ 204,361us-gaap_SalesRevenueNet $ 172,640us-gaap_SalesRevenueNet
Income from operations 2,985us-gaap_OperatingIncomeLoss 4,252us-gaap_OperatingIncomeLoss 4,933us-gaap_OperatingIncomeLoss 3,782us-gaap_OperatingIncomeLoss 3,296us-gaap_OperatingIncomeLoss 4,048us-gaap_OperatingIncomeLoss 4,805us-gaap_OperatingIncomeLoss [1] 3,225us-gaap_OperatingIncomeLoss [1] 15,952us-gaap_OperatingIncomeLoss 15,374us-gaap_OperatingIncomeLoss 13,296us-gaap_OperatingIncomeLoss
Net income $ 2,307us-gaap_NetIncomeLoss $ 3,106us-gaap_NetIncomeLoss $ 3,446us-gaap_NetIncomeLoss $ 2,632us-gaap_NetIncomeLoss $ 2,452us-gaap_NetIncomeLoss $ 2,816us-gaap_NetIncomeLoss $ 3,160us-gaap_NetIncomeLoss $ 2,641us-gaap_NetIncomeLoss [2] $ 11,491us-gaap_NetIncomeLoss $ 11,069us-gaap_NetIncomeLoss $ 5,457us-gaap_NetIncomeLoss
Basic net income per common share $ 0.14us-gaap_EarningsPerShareBasic $ 0.19us-gaap_EarningsPerShareBasic $ 0.21us-gaap_EarningsPerShareBasic $ 0.16us-gaap_EarningsPerShareBasic $ 0.15us-gaap_EarningsPerShareBasic $ 0.17us-gaap_EarningsPerShareBasic $ 0.19us-gaap_EarningsPerShareBasic $ 0.16us-gaap_EarningsPerShareBasic $ 0.70us-gaap_EarningsPerShareBasic $ 0.68us-gaap_EarningsPerShareBasic $ 0.48us-gaap_EarningsPerShareBasic
Diluted net income per common share $ 0.14us-gaap_EarningsPerShareDiluted $ 0.19us-gaap_EarningsPerShareDiluted $ 0.21us-gaap_EarningsPerShareDiluted $ 0.16us-gaap_EarningsPerShareDiluted $ 0.15us-gaap_EarningsPerShareDiluted $ 0.17us-gaap_EarningsPerShareDiluted $ 0.19us-gaap_EarningsPerShareDiluted $ 0.16us-gaap_EarningsPerShareDiluted $ 0.69us-gaap_EarningsPerShareDiluted $ 0.66us-gaap_EarningsPerShareDiluted $ 0.37us-gaap_EarningsPerShareDiluted
[1] Contains expenses related to the January 2013 and April 2013 secondary offerings, which decreased income from operations by $417,000 in the first quarter of 2013 and $508,000 in the second quarter of 2013, respectively.
[2] Contains a $556,000 pre-tax favorable income tax benefit, in the first quarter, related to incremental employment tax credits for 2013 as well as the previous open tax years.