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Leases: (Details Narrative) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Leases [Abstract]        
Operating lease, weighted average remaining lease term 6 years   6 years  
Operating lease, eeighted average discount rate, percent 2.60%   2.60%  
Operating leases, rent expense, net $ 1,200,000 $ 1,900,000 $ 4,300,000 $ 6,800,000
Operating Lease, Payments     3,900,000 6,200,000
Noncash additions to operating lease assets     $ 500,000 $ 14,000,000.0