Note 4. Stock-based Compensation (Details)	9 Months Ended
	Sep. 30, 2015 $ / shares shares
Option 1
Exercise Price Range	0.01 - $1.00
Number of Options Outstanding	19,700
Weighted Average Remaining Contractual Life (in Years)	6 years 3 months 22 days
Weighted Average Exercise Price | $ / shares	$ 0.01
Number of Options Exercisable	19,700
Option 2
Exercise Price Range	1.01 - $2.00
Number of Options Outstanding	4,550
Weighted Average Remaining Contractual Life (in Years)	5 years 7 months 24 days
Weighted Average Exercise Price | $ / shares	$ 1.70
Number of Options Exercisable	4,550
Option 3
Exercise Price Range	2.01 - $3.00
Number of Options Outstanding	9,000
Weighted Average Remaining Contractual Life (in Years)	2 years 3 months 11 days
Weighted Average Exercise Price | $ / shares	$ 2.69
Number of Options Exercisable	1,500
Option 4
Exercise Price Range	3.01 - $4.00
Number of Options Outstanding	14,000
Weighted Average Remaining Contractual Life (in Years)	6 years 6 months 4 days
Weighted Average Exercise Price | $ / shares	$ 3.33
Number of Options Exercisable	14,000
Option 5
Exercise Price Range	4.01 - $8.00
Number of Options Outstanding	98,750
Weighted Average Remaining Contractual Life (in Years)	5 years 6 months 25 days
Weighted Average Exercise Price | $ / shares	$ 7.76
Number of Options Exercisable	48,750
Option 6
Exercise Price Range	8.01 - $9.00
Number of Options Outstanding	40,000
Weighted Average Remaining Contractual Life (in Years)	2 years 10 months 20 days
Weighted Average Exercise Price | $ / shares	$ 8.25
Number of Options Exercisable	22,500
Option 7
Exercise Price Range	9.01 - $10.00
Number of Options Outstanding	14,000
Weighted Average Remaining Contractual Life (in Years)	9 years 2 months 26 days
Weighted Average Exercise Price | $ / shares	$ 9.26
Number of Options Exercisable	0
Option 8
Exercise Price Range	10.01-$13.49
Number of Options Outstanding	40,000
Weighted Average Remaining Contractual Life (in Years)	3 years 5 months 8 days
Weighted Average Exercise Price | $ / shares	$ 13.49
Number of Options Exercisable	15,000
Total
Number of Options Outstanding	240,000
Weighted Average Remaining Contractual Life (in Years)	4 years 11 months 23 days
Weighted Average Exercise Price | $ / shares	$ 7.68
Number of Options Exercisable	126,000