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7. MARKETABLE SECURITIES (Details Narrative) - Bank Certificate Of Deposits [member]
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Bottom Of Range [Member]      
Disclosure of Investment Securities [line items]      
Investment rate remunerated at percentage of rate for interbank deposits 101.95% 102.00% 102.01%
Bottom Of Range [Member] | Debentures [Member]      
Disclosure of Investment Securities [line items]      
Investment rate remunerated at percentage of rate for interbank deposits 108.25% 104.25% 104.25%
Top of Range [Member]      
Disclosure of Investment Securities [line items]      
Investment rate remunerated at percentage of rate for interbank deposits 113.00% 111.25% 112.00%
Top of Range [Member] | Debentures [Member]      
Disclosure of Investment Securities [line items]      
Investment rate remunerated at percentage of rate for interbank deposits 113.00% 151.00% 161.54%