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Note 8 - Concentration of Credit Risk (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Sales	$ 13,979,177	$ 15,359,637
Customer One [Member]
Net Sales	$ 4,450,000	$ 4,427,000
Customer One [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Percent of net sales	31.80%	28.80%
Customer Two [Member]
Net Sales	$ 2,471,000	$ 2,609,000
Customer Two [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Percent of net sales	17.70%	17.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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