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At December 31, 2021 and 2020, inventories consisted of: (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Inventory Disclosure [Abstract] |  |
Raw materials, parts and supplies | $ 2,421,000 | $ 1,189,000
Work-in-progress | 1,107,000 | 1,923,000
Finished products | 1,954,000 | 262,000
Total inventories | $ 5,482,000 | $ 3,374,000

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