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Number of customers accounted for more than five percent of revenue.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Basis of Presentation and General Information (Narrative) (Details) $ / shares in Units, shares in Millions	1 Months Ended		3 Months Ended		12 Months Ended
	Dec. 31, 2013 $ / shares	Dec. 31, 2012 $ / shares	Mar. 31, 2017 USD ($)	Jan. 01, 2016 shares	Dec. 29, 2017 USD ($) customer segment $ / shares shares	Dec. 30, 2016 USD ($) customer $ / shares shares	Jan. 01, 2016 USD ($) customer	Mar. 09, 2018 $ / shares
Basis Of Presentation And General Information [Line Items]
Restricted cash					$ 0	$ 0
Dividend declared \| $ / shares		$ 0.10			$ 0.30	$ 0.26
Dividend paid \| $ / shares	$ 0.10	$ 0.10				$ 0.23
Period of intangible assets amortized					10 years
Amortization expense					$ 2,090,000	$ 1,100,000	$ 2,207,000
Future amortization expense, 2018					2,400,000
Future amortization expense, 2019					700,000
Future amortization expense, 2020					600,000
Future amortization expense, 2021					600,000
Future amortization expense, 2022					300,000
Future amortization expense, after 2022					$ 700,000
Antidilutive common share equivalents \| shares				0.5	0.8	0.8
Number of customers accounted for more than five percent of revenue \| customer					0	0	0
Number of operating segments \| segment					1
Income tax expense					$ 2,884,000	$ 12,625,000	$ 7,707,000
U.S statutory income tax expense rate					35.00%	35.00%	35.00%
Accounting Standards Update 2016-09 [Member]
Basis Of Presentation And General Information [Line Items]
Income tax expense			$ 0
U.S statutory income tax expense rate					34.00%
Minimum [Member]
Basis Of Presentation And General Information [Line Items]
Useful life of property and equipment					3 years
Maximum [Member]
Basis Of Presentation And General Information [Line Items]
Useful life of property and equipment					10 years
Subsequent Event [Member]
Basis Of Presentation And General Information [Line Items]
Dividend declared \| $ / shares								$ 0.34