Note 8. Stock Options and Restricted Stock Units (Details 1)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Number of options outstanding, ending	98,563
Option 1
Exercise price range	0.01 - $7.00
Number of options outstanding, ending	10,000
Weighted average exercise price | $ / shares	$ 6.80
Weighted average remaining contractual life (in years)	6 years 10 months 20 days
Number of options exercisable	9,167
Option 2
Exercise price range	7.01 - $8.00
Number of options outstanding, ending	20,313
Weighted average exercise price | $ / shares	$ 7.76
Weighted average remaining contractual life (in years)	4 years 8 months 27 days
Number of options exercisable	20,313
Option 3
Exercise price range	8.01 - $10.00
Number of options outstanding, ending	4,250
Weighted average exercise price | $ / shares	$ 9.26
Weighted average remaining contractual life (in years)	5 years 11 months 26 days
Number of options exercisable	4,250
Option 4
Exercise price range	10.01 - $15.00
Number of options outstanding, ending	32,000
Weighted average exercise price | $ / shares	$ 13.00
Weighted average remaining contractual life (in years)	8 years 8 months 27 days
Number of options exercisable	32,000
Option 5
Exercise price range	15.01 - $17.40
Number of options outstanding, ending	32,000
Weighted average exercise price | $ / shares	$ 17.40
Weighted average remaining contractual life (in years)	9 years 5 months 1 day
Number of options exercisable	0
Total
Number of options outstanding, ending	98,563
Weighted average exercise price | $ / shares	$ 12.56
Number of options exercisable	65,730