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(1) Summary of Significant Accounting Policies (Details - Stock purchases) - Common Stock [Member] - $ / shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
StockPurchasesLineItems [Line Items]    
Total stock purchases, shares 791,683 291,156
Total stock purchases, average price per share $ 4.99 $ 3.32
Open Market Purchases[Member]    
StockPurchasesLineItems [Line Items]    
Total stock purchases, shares 734,700 44,247
Total stock purchases, average price per share $ 5.03 $ 2.94
Shares Redeemed [Member]    
StockPurchasesLineItems [Line Items]    
Total stock purchases, shares 56,983 46,909
Total stock purchases, average price per share $ 4.47 $ 2.86
Other Purchases [Member]    
StockPurchasesLineItems [Line Items]    
Total stock purchases, shares 0 200,000
Total stock purchases, average price per share $ 0 $ 3.51