1. Summary of Significant Accounting Policies (Details - Stock purchases) - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Accounting Policies [Abstract]
Open market purchases	714,898	1,102,410
Average price for open market purchases	$ 3.81	$ 4.74
Shares redeemed upon net exercise of stock options	33,599	30,149
Average price for shares redeemed upon net exercise of stock options	$ 4.37	$ 4.86
Other purchases	90,000	0
Average price for other stock purchases	$ 4.13
Total stock purchases	838,497	1,132,559
Average price for total stock purchases	$ 3.87	$ 4.75