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Leases: (Details Narrative) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Leases [Abstract]          
Operating lease, weighted average remaining lease term 5 years 7 months 6 days 5 years 7 months 6 days      
Operating lease, weighted average discount rate, percent 2.80% 2.80%      
Operating leases, rent expense, net $ 1,500,000 $ 2,900,000   $ 1,300,000 $ 3,100,000
Operating lease, payments   2,600,000 $ 2,800,000    
Noncash additions to operating lease assets   $ 2,400,000 $ 500,000