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Basis of Presentation and General Information (Narrative) (Details) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 02, 2021 $ / shares | Dec. 31, 2012 $ / shares | Jan. 01, 2021 USD ($) customer segment $ / shares | Dec. 27, 2019 USD ($) customer $ / shares | Dec. 28, 2018 USD ($) customer $ / shares
Basis Of Presentation And General Information [Line Items] |  |  |  |  |
Dividend declared | $ / shares |  | $ 0.10 | $ 0.38 | $ 0.36 | $ 0.34
Dividends payable nature |  |  | In addition, during 2020, the Company’s Board of Directors approved the increase in the frequency of dividend payments to a quarterly basis. During 2020, the Company funded one semi-annual dividend that was declared in 2019 and three quarterly dividends declared in 2020, including the dividend declared in the fourth quarter of 2020. |  |
Period of intangible assets amortized |  |  | 5 years |  |
Amortization of Intangible Assets |  |  | $ 977,000 | $ 1,036,000 | $ 2,369,000
Future amortization expense, 2021 |  |  | 900,000 |  |
Future amortization expense, 2022 |  |  | 300,000 |  |
Revenue recognized as a result of change in contract liability |  |  | 9,200,000 | 7,700,000 |
Deferred commissions |  |  | 1,500,000 | 1,600,000 |
Commissions expense |  |  | 1,500,000 | $ 1,400,000 |
Impairment loss recognized to capitalization of deferred commission |  |  | $ 0 |  |
Number of customers accounted for more than five percent of revenue | customer |  |  | 0 | 0 | 0
Number of operating segments | segment |  |  | 1 |  |
ASU 2016-13 [Member] |  |  |  |  |
Basis Of Presentation And General Information [Line Items] |  |  |  |  |
Change in accounting principle, accounting standards update, adoption date |  |  | Jan. 31, 2020 |  |
Change in accounting principle, accounting standards update, adopted |  |  | true |  |
Change in accounting principle, accounting standards update, immaterial effect |  |  | true |  |
Minimum [Member] |  |  |  |  |
Basis Of Presentation And General Information [Line Items] |  |  |  |  |
Useful life of property and equipment |  |  | 3 years |  |
Business relationship agreement period |  |  | 6 months |  |
Maximum [Member] |  |  |  |  |
Basis Of Presentation And General Information [Line Items] |  |  |  |  |
Useful life of property and equipment |  |  | 10 years |  |
Business relationship agreement period |  |  | 12 months |  |
Customer contract period |  |  | 12 months |  |
Subsequent Event [Member] |  |  |  |  |
Basis Of Presentation And General Information [Line Items] |  |  |  |  |
Dividend declared | $ / shares | $ 0.40 |  |  |  |

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