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Note 10 - Concentration of Credit Risk (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Three Months Ended |  |  | Three Months Ended |
|  | September 30, 2021 |  |  | September 30, 2020 |
Customer |  | Net Sales |  |  | % of Net Sales |  |  | Net Sales |  |  | % of Net Sales |
Customer A |  | $ | 3,304,000 |  |  |  | 53 | % |  | $ | 3,737,000 |  |  |  | 63 | %
Customer B |  | $ | 617,000 |  |  |  | 10 | % |  | $ | - |  |  |  | 0 | %%
|  | Nine Months Ended |  |  | Nine Months Ended |
|  | September 30, 2021 |  |  | September 30, 2020 |
Customer |  | Net Sales |  |  | % of Net Sales |  |  | Net Sales |  |  | % of Net Sales |
Customer A |  | $ | 10,648,000 |  |  |  | 53 | % |  | $ | 8,190,000 |  |  |  | 44 | %
Customer B |  | $ | 2,384,000 |  |  |  | 12 | % |  | $ | 2,912,000 |  |  |  | 16 | %

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