3. REVENUE FROM CONTRACTS WITH CUSTOMERS (Details - Disaggregation of Revenue) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Revenues	$ 3,922	$ 3,605
Fixed-price Contract [Member]
Revenues	1,294	1,744
Service Contracts [Member]
Revenues	$ 2,628	$ 1,861

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details