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2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES : Trading Securities (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Short-term Investments | $ 22,539 |  | $ 111,386
Available-for-sale Securities, Gross Unrealized Gain |  | $ 1,914 | 354
Available-for-sale Securities, Gross Unrealized Loss |  | $ (4,756) | (757)
Investment Owned, at Fair Value | 19,697 |  | 110,983
Trading Securites Other Equity [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Short-term Investments | 22,539 |  |
Available-for-sale Securities, Gross Unrealized Gain | 1,914 |  |
Available-for-sale Securities, Gross Unrealized Loss | (4,756) |  |
Investment Owned, at Fair Value | $ 19,697 |  |
Trading Securites Debt [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Short-term Investments |  |  | 93,712
Available-for-sale Securities, Gross Unrealized Gain |  |  | 143
Available-for-sale Securities, Gross Unrealized Loss |  |  | (12)
Investment Owned, at Fair Value |  |  | 93,843
Trading Securites Equity [Member] |  |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |  |
Short-term Investments |  |  | 17,674
Available-for-sale Securities, Gross Unrealized Gain |  |  | 211
Available-for-sale Securities, Gross Unrealized Loss |  |  | (745)
Investment Owned, at Fair Value |  |  | $ 17,140

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