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Inventories: Inventories (Details) - USD ($)
Jun. 30, 2024
Dec. 31, 2023
Details    
Raw material $ 2,584,541 $ 2,878,869
Work-in-process 2,437,309 2,374,795
Finished goods 2,455,844 2,614,989
Inventories, gross 7,477,694 7,868,653
Valuation reserves (540,000) (541,000)
Inventories, net $ 6,937,694 $ 7,327,653