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Note 9 - Concentration of Credit Risk (Tables) | 3 Months Ended
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Mar. 31, 2019
Notes Tables |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Three Months Ended |  |  | Three Months Ended |
|  | March 31, 2019 |  |  | March 31, 2018 |
Customer |  | Net Sales |  |  | % of Net Sales |  |  | Net Sales |  |  | % of Net Sales |
Customer A |  | $ | 3,861,000 |  |  |  | 30.8 | % |  | $ | 4,450,000 |  |  |  | 31.8 | %
Customer B |  | $ | 2,159,000 |  |  |  | 17.2 | % |  | $ | 2,471,000 |  |  |  | 17.7 | %

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