Inventories (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Inventories
Raw materials	$ 2,079,845us-gaap_InventoryRawMaterials	$ 2,020,151us-gaap_InventoryRawMaterials
Work-in-progress	442,000us-gaap_InventoryWorkInProcess	407,964us-gaap_InventoryWorkInProcess
Finished goods	1,535,921us-gaap_InventoryFinishedGoods	1,517,151us-gaap_InventoryFinishedGoods
Reduction to LIFO cost	(1,314,404)us-gaap_InventoryValuationReserves	(1,314,616)us-gaap_InventoryValuationReserves
Total inventory	$ 2,743,362us-gaap_InventoryNet	$ 2,630,650us-gaap_InventoryNet

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of valuation reserve for inventory.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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