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Inventories: Inventories (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Details    
Raw material $ 3,922,808 $ 2,245,709
Work-in-process 2,190,572 1,410,868
Finished goods 2,239,890 2,096,717
Inventories, gross 8,353,270 5,753,294
Valuation reserves (608,000) (600,000)
Inventories, net $ 7,745,270 $ 5,153,294