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Note 10 - Concentration of Credit Risk (Tables) | 6 Months Ended
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Jun. 30, 2020
Notes Tables |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Three Months Ended |  |  | Three Months Ended |
|  | June 30 , 2020 |  |  | June 30 , 2019 |
Customer |  | Net Sales |  |  | % of Net Sales |  |  | Net Sales |  |  | % of Net Sales |
Customer A |  | $ | 2,508,000 |  |  |  | 43 | % |  | $ | 2,769,000 |  |  |  | 30 | %
|  | Six Months Ended |  |  | Six Months Ended |
|  | June 30, 2020 |  |  | June 30, 2019 |
Customer |  | Net Sales |  |  | % of Net Sales |  |  | Net Sales |  |  | % of Net Sales |
Customer A |  | $ | 5,675,000 |  |  |  | 44 | % |  | $ | 6,630,000 |  |  |  | 37 | %

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