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Note 8 - Concentration of Credit Risk (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

		Three Months Ended								Three Months Ended
		March 31, 2018								March 31, 2017
Customer		Net Sales				% of Net Sales				Net Sales				% of Net Sales
Customer A		$	4,450,000				31.8%			$	4,427,000				28.8%
Customer B		$	2,471,000				17.7%			$	2,609,000				17.0%

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- Definition

Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark.

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