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NOTE 1 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Disaggregation of revenue |
Net sales by type |  | 2020 |  |  | 2019 |
(in thousands) |  |  |  |  |  |
Equipment Sales |  | $ | 11,480 |  |  | $ | 12,553 |
Adapter Sales |  |  | 5,527 |  |  |  | 5,535 |
Software and Maintenance Sales * |  |  | 3,321 |  |  |  | 3,480 |
Total |  | $ | 20,328 |  |  | $ | 21,568 |
* includes an insignificant amount of service and part sales
Concentration Risk |
Percentage of Consolidated Accounts Receivable |  | 2020 |  |  | 2019 |  |  | 2018 |
Number of customers |  |  | 3 |  |  |  | 2 |  |  |  | 3 |
Approximate percentage of consolidated accounts receivable balance |  |  | 41 | % |  |  | 32 | % |  |  | 35 | %
Percentage of each |  |  | 17 | % |  |  | 17 | % |  |  | 12 | %
Percentage of each |  |  | 12 | % |  |  | 15 | % |  |  | 12 | %
Percentage of each |  |  | 12 | % |  |  | n/a |  |  |  | 11 | %
Diversification of net sales The following represented greater than 10% of net sales for the applicable year:
Percentage of Net Sales |  | 2020 |  |  | 2019 |  |  | 2018 |
Number of customers |  |  | 1 |  |  |  | 1 |  |  |  | 2 |
Approximate percentage of net sales |  |  | 12 | % |  |  | 11 | % |  |  | 29 | %
Percentage of each |  |  | 12 | % |  |  | 11 | % |  |  | 16 | %
Percentage of each |  |  | n/a |  |  |  | n/a |  |  |  | 13 | %

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