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Note 9 - Concentration of Credit Risk - Concentration of Credit Risk, Net Sales (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net Sales	$ 11,525,469	$ 13,225,954	$ 41,489,372	$ 41,397,288
Customer One [Member]
Net Sales	$ 2,686,030	$ 3,195,486	$ 10,796,452	$ 11,489,409
Customer One [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Percent of net sales	23.30%	24.20%	26.00%	27.80%
Customer Two [Member]
Net Sales	$ 2,395,460	$ 2,283,424	$ 9,737,989	$ 6,457,251
Customer Two [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Percent of net sales	20.80%	17.30%	23.50%	15.60%

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.

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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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