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Summary of Significant Accounting Policies (Details - Stock purchases) - Common Stock [Member] - $ / shares | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Equity, Class of Treasury Stock [Line Items] |  |
Total stock purchases, shares | 1,784,246 | 2,831,790
Total stock purchases, average price per share | $ 10.35 | $ 12.09
Open Market Purchases [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Total stock purchases, shares | 564,202 | 1,938,637
Total stock purchases, average price per share | $ 10.36 | $ 11.42
Shares Redeemed [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Total stock purchases, shares | 1,220,044 | 893,153
Total stock purchases, average price per share | $ 10.34 | $ 13.56

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