1. Summary of Significant Accounting Policies (Details - Stock purchases) - Common Stock [Member] - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Total stock purchases	365,546	354,780
Average price for total stock purchases	$ 3.97	$ 3.97
Open Market Purchases [Member]
Total stock purchases	335,546	231,181
Average price for total stock purchases	$ 3.95	$ 3.86
Shares redeemed upon net exercise of stock options
Total stock purchases	5,500	33,599
Average price for total stock purchases	$ 4.20	$ 4.37
Other Purchases [Member]
Total stock purchases	24,500	90,000
Average price for total stock purchases	$ 4.20	$ 4.13