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1. Summary of Significant Accounting Policies (Details - Stock purchases) - Common Stock - $ / shares
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Total stock purchases 378,470 838,497
Average price for total stock purchases $ 3.97 $ 3.87
Open Market Purchases [Member]    
Total stock purchases 335,546 714,898
Average price for total stock purchases $ 3.95 $ 3.81
Shares redeemed upon net exercise of stock options    
Total stock purchases 18,424 33,599
Average price for total stock purchases $ 3.76 $ 4.37
Other Purchases [Member]    
Total stock purchases 24,500 90,000
Average price for total stock purchases $ 4.20 $ 4.13