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(1) Summary of Significant Accounting Policies (Details - Stock purchases) - Common Stock [Member] - $ / shares
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Equity, Class of Treasury Stock [Line Items]    
Total stock purchases, shares 2,831,790 358,071
Total stock purchases, average price per share $ 12.09 $ 4.42
Open Market Purchases[Member]    
Equity, Class of Treasury Stock [Line Items]    
Total stock purchases, shares 1,938,637 301,088
Total stock purchases, average price per share $ 11.42 $ 4.18
Shares Redeemed [Member]    
Equity, Class of Treasury Stock [Line Items]    
Total stock purchases, shares 893,153 56,983
Total stock purchases, average price per share $ 13.56 $ 4.47