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7. MARKETABLE SECURITIES (Details Narrative)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debentures [member] | Bottom Of Range [member]      
Disclosure of Investment Securities [line items]      
Investment rate remunerated at percentage of rate for interbank deposits 1.00% 108.25% 104.25%
Debentures [member] | Top of Range [member]      
Disclosure of Investment Securities [line items]      
Investment rate remunerated at percentage of rate for interbank deposits 109.00% 113.00% 151.00%
Financial Notes Banks [member] | Bottom Of Range [member]      
Disclosure of Investment Securities [line items]      
Investment rate remunerated at percentage of rate for interbank deposits 99.50% 101.95% 102.00%
Financial Notes Banks [member] | Top of Range [member]      
Disclosure of Investment Securities [line items]      
Investment rate remunerated at percentage of rate for interbank deposits 130.00% 113.00% 111.25%