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NOTE 1 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
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 %