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Leases: (Details Narrative) - USD ($)
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Leases [Abstract]    
Operating lease, weighted average remaining lease term 5 years 6 months  
Operating lease, weighted average discount rate, percent 2.60%  
Operating leases, rent expense, net $ 1,400,000 $ 1,800,000
Operating Lease, Payments 1,300,000 1,700,000
Noncash additions to operating lease assets $ 0 $ 0