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7. Shareholders' Equity (Details - Stock purchases) - Common Stock [Member] - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Total stock purchases, shares 378,470 1,382,401
Total stock purchases, average price per share $ 3.97 $ 3.81
Open Market Purchases [Member]    
Total stock purchases, shares 335,546 1,258,797
Total stock purchases, average price per share $ 3.95 $ 3.77
Shares redeemed upon net exercise of stock options [Member]    
Total stock purchases, shares 18,424 33,604
Total stock purchases, average price per share $ 3.76 $ 4.37
Other Repurchases [Member]    
Total stock purchases, shares 24,500 90,000
Total stock purchases, average price per share $ 4.20 $ 4.13