Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies - Schedule of Disaggregated Net Sales (Details)

v3.21.1
Organization and Summary of Significant Accounting Policies - Schedule of Disaggregated Net Sales (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Total net sales $ 3,290 $ 2,860
Telecom [Member]    
Total net sales 3,053 2,717
Government/Military [Member]    
Total net sales 31 4
Marine [Member]    
Total net sales 1
Other (backup DC power to various industries) [Member]    
Total net sales 206 138
DC Power Systems [Member]    
Total net sales 3,155 2,713
Engineering & Tech Support Services [Member]    
Total net sales 28 76
Accessories [Member]    
Total net sales $ 107 $ 71