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Basis of Presentation - Reconciliation of Earnings Per Share (Details) $ / shares in Units, shares in Thousands, $ in Thousands			3 Months Ended
		Nov. 27, 2018	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) $ / shares shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Weighted average basic shares outstanding (shares)	[1]		13,737	13,827
Potentially dilutive common shares related to:
Stock options (shares)			155	150
Unvested restricted stock awards (shares)			32	34
Weighted average diluted shares outstanding (shares)	[1]		13,924	14,011
Net income | $			$ 7,479	$ 6,389
Basic EPS (usd per share) | $ / shares	[1]		$ 0.54	$ 0.46
Diluted EPS (usd per share) | $ / shares	[1]		$ 0.54	$ 0.46
Weighted average anti-dilutive shares not included in the calculation of diluted EPS (shares)			20	63
Stock split, conversion ratio		2
[1] Share and per share data have been adjusted to reflect the two-for-one stock split effective November 27, 2018.

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