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Inventories: Inventories (Details) - USD ($)
Mar. 31, 2022
Dec. 31, 2021
Details    
Raw material $ 5,246,227 $ 4,645,923
Work-in-process 2,526,418 2,181,457
Finished goods 2,482,595 2,304,400
Inventories, gross 10,255,240 9,131,780
Valuation reserves (642,000) (612,000)
Inventories, net $ 9,613,240 $ 8,519,780