Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Total net sales $ 9,031 $ 24,801
Telecom [Member]    
Total net sales 8,640 23,753
Government/Military [Member]    
Total net sales 120 589
Marine [Member]    
Total net sales 5 83
Other (backup DC power to various industries) [Member]    
Total net sales 266 376
DC Power Systems [Member]    
Total net sales 8,659 24,177
Engineering & Tech Support Services [Member]    
Total net sales 226 281
Accessories [Member]    
Total net sales $ 146 $ 343