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1. Summary of Significant Accounting Policies (Details - Options outstanding) - $ / shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Number of Shares    
Outstanding options, beginning balance 13,135,000  
Granted 40,000  
Exercised (308,000) (279,000)
Forfeited 0  
Outstanding options, ending balance 12,867,000  
Options exercisable at the end of period 8,687,000  
Weighted Average Exercise Price    
Outstanding options, beginning balance $ 4.66  
Granted 3.74  
Exercised 1.54  
Forfeited  
Outstanding options, ending balance 4.73  
Options exercisable at the end of period $ 4.67  
Weighted Average Remaining Contractual Term    
Weighted Average Remaining Contractual Term, ending 4 years 3 months 18 days  
Options exercisable at the end of period 3 years 11 months 5 days