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7. STOCKHOLDERS' EQUITY (Details) - Common Stock [Member] - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Apr. 23, 2020 | Jun. 30, 2020
Class of Stock [Line Items] |  |  |
Number of shares repurchased | 576,898 | 1,107,639 | 1,684,537
Average price paid per share | $ 2.28 | $ 2.42 | $ 2.37
Approximate value of shares that may yet be purchased | $ 8,686,000 | $ 6,001,000 |
Plan expiration date | Jul. 31, 2020 | Jul. 31, 2020 |

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