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Note 4. Stock Options and Restricted Stock Units (Details)	6 Months Ended
	Jun. 30, 2019 $ / shares shares
Option 1
Exercise price range	$0.01 - $7.00
Number of options outstanding	10,000
Weighted average remaining contractual life (in years)	6 years 4 months 20 days
Weighted average exercise price | $ / shares	$ 6.80
Number of options exercisable	10,000
Option 2
Exercise price range	$7.01 - $8.00
Number of options outstanding	20,313
Weighted average remaining contractual life (in years)	4 years 2 months 26 days
Weighted average exercise price | $ / shares	$ 7.76
Number of options exercisable	20,313
Option 3
Exercise price range	$8.01 - $12.00
Number of options outstanding	4,250
Weighted average remaining contractual life (in years)	5 years 5 months 26 days
Weighted average exercise price | $ / shares	$ 9.26
Number of options exercisable	4,250
Option 4
Exercise price range	$12.01 - $15.00
Number of options outstanding	57,000
Weighted average remaining contractual life (in years)	8 years 10 months 13 days
Weighted average exercise price | $ / shares	$ 13.09
Number of options exercisable	32,000
Option 5
Exercise price range	$15.01 - $17.40
Number of options outstanding	32,000
Weighted average remaining contractual life (in years)	8 years 11 months 1 day
Weighted average exercise price | $ / shares	$ 17.40
Number of options exercisable	32,000
Total
Number of options outstanding	123,563
Weighted average remaining contractual life (in years)	7 years 9 months 22 days
Weighted average exercise price | $ / shares	$ 12.69
Number of options exercisable	98,563

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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