Quarterly report [Sections 13 or 15(d)]

Selected Balance Sheet Data - Narrative (Details)

v3.26.1
Selected Balance Sheet Data - Narrative (Details)
$ in Thousands
 3 Months Ended
Jan. 01, 2026
Jan. 01, 2025
Jan. 01, 2014
Mar. 31, 2026
USD ($)
installment
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Mar. 31, 2013
USD ($)
Schedule Of Accrued Expenses [Line Items]              
Advances and loans and commissions receivable allowance for credit loss       $ 1,000   $ 1,100  
SARs frozen liability amount       6,593   $ 7,343  
Interest expense       $ 153 $ 187    
Commissions Payable              
Schedule Of Accrued Expenses [Line Items]              
Maximum payment deferral period for certain commissions payable       3 years      
SARs              
Schedule Of Accrued Expenses [Line Items]              
SARs frozen liability amount             $ 20,000
Number of annual installments | installment       10      
Treasury note term     10 years        
Base spread on SARs liability variable rate     2.00%        
SARs liability interest accrual rates 6.19% 6.57%          
Interest expense       $ 114 156    
Payments for SARs Liability       $ 2,800 2,600    
Deferred Compensation Liability              
Schedule Of Accrued Expenses [Line Items]              
Fair value of deferred compensation plan assets       110.00%      
Payments made during the period       $ 88 $ 143    
Deferred Compensation Liability | Minimum              
Schedule Of Accrued Expenses [Line Items]              
Payout period       2 years      
Deferred Compensation Liability | Maximum              
Schedule Of Accrued Expenses [Line Items]              
Payout period       15 years