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Inventories: Inventories (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Details    
Raw material $ 2,702,486 $ 2,798,918
Work-in-process 1,873,733 1,878,977
Finished goods 2,097,604 2,001,496
Inventory, gross 6,673,823 6,679,391
Valuation reserves (575,000) (579,000)
Inventories, net $ 6,098,823 $ 6,100,391