Quarterly report pursuant to Section 13 or 15(d)

10. Stock Options (Details-Option activity)

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10. Stock Options (Details-Option activity) - Stock Options [Member] - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Stock Options    
Number of Options outstanding beginning balance 1,294,045  
Number of Options Granted  
Number of Options Exercised  
Number of Options Cancelled 56,835  
Number of Options Expired  
Number of Options outstanding ending balance 1,237,210 1,294,045
Number of Options exercisable 1,070,869 1,070,869
Exercise Price Per Share    
Exercise price per share, range $2.82 - 12.00   
Exercise price per share, options cancelled $9.00 - 12.00  
Exercise price per share, exercisable $2.82 - 9.00   
Exercise prices at period end $2.82 - 9.00  2.82 - 12.00 
Weighted Average Remaining Contractual Life 2 years 8 months 19 days 2 years 11 months 26 days
Weighted average remaining contractual life, options cancelled 3 years 6 months 25 days  
Weighted average remaining contractual life, exercisable 2 years 8 months 19 days 2 years 11 months 16 days
Aggregate Intrinsic Value    
Aggregate intrinsic value, options outstanding $ 0  
Aggregate intrinsic value, exercisable $ 0  
Weighted Average Exercise Price per Share beginning balance $ 8.14 $ 8.14
Weighted Average Exercise Price Options Cancelled 10.06  
Weighted Average Exercise Price per Share ending balance 8.05 8.14
Weighted Average Exercise Price per Share Exercisable $ 7.44 $ 7.44