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Inventories: Inventories (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Details      
Raw material $ 2,231,154 $ 1,812,603  
Work-in-process 1,828,478 1,604,867  
Finished goods 1,784,701 1,674,630  
Inventory, gross 5,844,333 5,092,100  
Valuation reserves (590,000) (564,000)  
Inventories, net $ 5,254,333 $ 4,528,100 $ 5,088,117