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Leases: (Details Narrative) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Leases [Abstract]        
Operating lease, weighted average remaining lease term 6 years 3 months 19 days   6 years 3 months 19 days  
Operating lease, eeighted average discount rate, percent 2.60%   2.60%  
Operating leases, rent expense, net $ 1,300,000 $ 3,100,000 $ 3,100,000 $ 4,900,000
Operating Lease, Payments     2,800,000 4,600,000
Noncash additions to operating lease assets     $ 500,000 $ 13,800,000