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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Sales	$ 8,537,475	$ 11,525,469	$ 33,480,704	$ 41,489,372
Customer One [Member]
Net Sales	$ 1,799,000	$ 2,395,000	$ 8,136,000	$ 9,738,000
Customer One [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of net sales	21.00%	21.00%	24.00%	23.00%
Customer Two [Member]
Net Sales	$ 1,559,000	$ 2,686,000	$ 8,424,000	$ 10,796,000
Customer Two [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of net sales	18.00%	23.00%	25.00%	26.00%

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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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.

+ References

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