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Note 9 - Concentration of Credit Risk (Tables) | 6 Months Ended
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Jun. 30, 2019
Notes Tables |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Three Months Ended |  |  | Three Months Ended |
|  | June 30, 2019 |  |  | June 30, 2018 |
Customer |  | Net Sales |  |  | % of Net Sales |  |  | Net Sales |  |  | % of Net Sales |
Customer A |  | $ | 4,179,000 |  |  |  | 34 | % |  | $ | 4,871,000 |  |  |  | 30 | %
Customer B |  | $ | 2,769,000 |  |  |  | 22 | % |  | $ | 3,660,000 |  |  |  | 23 | %
|  | Six Months Ended |  |  | Six Months Ended |
|  | June 30, 2019 |  |  | June 30, 2018 |
Customer |  | Net Sales |  |  | % of Net Sales |  |  | Net Sales |  |  | % of Net Sales |
Customer A |  | $ | 6,337,000 |  |  |  | 25 | % |  | $ | 7,343,000 |  |  |  | 24 | %
Customer B |  | $ | 6,630,000 |  |  |  | 27 | % |  | $ | 8,110,000 |  |  |  | 27 | %

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