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Marketable Securities: (Tables)
 12 Months Ended
Dec. 31, 2022
Investments, All Other Investments [Abstract]  
Schedule of Marketable Securities Value
          December 31,   December 31,
          2022   2021
Equity securities                
Fair value and carrying value at beginning of year         $ 105,218 $ 83,575
Increase (decrease) in fair value           (7,165)   21,643
Fair value and carrying value at balance sheet date         $ 98,053 $ 105,218