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Selected Statements of Operations Data (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of revenues from sales to unaffiliated customers      
Revenues $ 33,010 $ 34,050 $ 37,233
North America [Member]      
Schedule of revenues from sales to unaffiliated customers      
Revenues 14,500 22,164 25,157
Asia [Member]      
Schedule of revenues from sales to unaffiliated customers      
Revenues [1] 14,146 7,158 4,874
Latin America [Member]      
Schedule of revenues from sales to unaffiliated customers      
Revenues 2,653 3,579 2,666
Other [Member]      
Schedule of revenues from sales to unaffiliated customers      
Revenues $ 1,711 $ 1,149 $ 4,536
[1] Includes Japan and the Philippines which each of them accounted for more than 10% of Company's revenues in 2019.