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Basis of Presentation and General Information (Narrative) (Details)
$ / shares in Units, shares in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 21, 2025
$ / shares
Sep. 23, 2024
USD ($)
Dec. 31, 2012
$ / shares
Dec. 27, 2024
USD ($)
$ / shares
Dec. 27, 2025
$ / shares
Dec. 27, 2024
USD ($)
BenchmarkingAndPerformanceStudies
Customer
Segment
shares
Dec. 29, 2023
USD ($)
Customer
Segment
shares
Dec. 30, 2022
USD ($)
Customer
$ / shares
Dec. 31, 2022
USD ($)
Basis Of Presentation And General Information [Line Items]                  
Dividend declared | $ / shares     $ 0.1         $ 0.44  
Dividends payable nature           During 2024, the Company declared four quarterly dividend payments of $0.11 per share each, the fourth of which was paid in January 2025.      
Period of intangible assets amortized       5 years   5 years      
Goodwill       $ 89,782,000   $ 89,782,000 $ 84,242,000    
Amortization expense           148,000   $ 154,000  
Revenue recognized as a result of change in contract liability           11,400,000 12,700,000    
Contract liabilities       11,118,000   11,118,000 12,087,000   $ 13,300,000
Deferred commissions       1,800,000   1,800,000 1,500,000    
Commissions expense           $ 1,100,000 $ 1,100,000    
Antidilutive common share equivalents | shares           2 2    
Number of operating segments | Segment           3      
Number of benchmarking and performance studies with major organizations | BenchmarkingAndPerformanceStudies           27,500      
Restricted cash balances       0   $ 0      
Estimated future amortization expense 2025       600,000   600,000      
Estimated future amortization expense 2026       500,000   500,000      
Estimated future amortization expense 2027       400,000   400,000      
Estimated future amortization expense 2028       400,000   400,000      
Estimated future amortization expense 2029       $ 300,000   300,000      
O2024 Q1 Dividends [Member]                  
Basis Of Presentation And General Information [Line Items]                  
Dividend declared | $ / shares       $ 0.11          
O2024 Q2 Dividends [Member]                  
Basis Of Presentation And General Information [Line Items]                  
Dividend declared | $ / shares       0.11          
O2024 Q3 Dividends [Member]                  
Basis Of Presentation And General Information [Line Items]                  
Dividend declared | $ / shares       0.11          
O2024 Q4 Dividends [Member]                  
Basis Of Presentation And General Information [Line Items]                  
Dividend declared | $ / shares       $ 0.11          
Leewayhertz Technologies Private Limited [Member]                  
Basis Of Presentation And General Information [Line Items]                  
Percentage of equity acquired   100.00%              
Purchase consideration   $ 7,806,000              
Goodwill   5,876,000              
Intangible assets   $ 2,500,000   $ 2,500,000   2,500,000      
Intangible assets, remaining weighted average useful life   4 years 7 months 6 days              
Transactions costs related to the acquisition       125,000   125,000      
Amortization expense           148,000      
Forecast [Member]                  
Basis Of Presentation And General Information [Line Items]                  
Dividend declared | $ / shares $ 0.48       $ 0.44        
Annual dividend approved percentage 9.00%                
Global S&BT [Member]                  
Basis Of Presentation And General Information [Line Items]                  
Goodwill       $ 63,090,000   $ 63,090,000 $ 57,550,000    
Number of customers accounted for six percent of revenue | Customer           1      
Number of customers accounted for seven percent of revenue | Customer             1 1  
Number of operating segments | Segment             3    
Dow Jones Industrials [Member]                  
Basis Of Presentation And General Information [Line Items]                  
Percentage of insights from benchmarking           97.00%      
Fortune 100 [Member]                  
Basis Of Presentation And General Information [Line Items]                  
Percentage of insights from benchmarking           90.00%      
DAX 40 [Member]                  
Basis Of Presentation And General Information [Line Items]                  
Percentage of insights from benchmarking           70.00%      
FTSE 100 [Member]                  
Basis Of Presentation And General Information [Line Items]                  
Percentage of insights from benchmarking           51.00%      
Minimum [Member]                  
Basis Of Presentation And General Information [Line Items]                  
Useful life of property and equipment       3 years   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   10 years      
Business relationship agreement period           12 months      
Customer contract period           12 months