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Note 7 - Inventory - Components of Inventory (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Finished goods	$ 476,418	$ 496,358
Fabricated assemblies	504,490	502,471
Total inventory	$ 980,908	$ 998,829

X

- Definition

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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- Definition

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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Aggregated amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed. This amount is net of valuation reserves and adjustments.

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