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Inventories: Inventories (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Details    
Raw material $ 2,315,730 $ 2,337,278
Work-in-process 1,091,787 1,201,099
Finished goods 1,865,269 1,869,800
Inventories, gross 5,272,786 5,408,177
Valuation reserves (527,000) (457,000)
Inventories, net $ 4,745,786 $ 4,951,177