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Leases: (Details Narrative) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Leases [Abstract]        
Operating lease, weighted average remaining lease term 5 years 4 months 24 days   5 years 4 months 24 days  
Operating lease, weighted average discount rate, percent 3.00%   3.00%  
Operating leases, rent expense, net $ 1,500,000 $ 1,200,000 $ 4,500,000 $ 4,300,000
Operating lease, payments     4,000,000 3,900,000
Noncash additions to operating lease assets     $ 5,700,000 $ 500,000