Note 8. Stock Options and Restricted Stock Units (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Notes to Financial Statements
Number of Options Outstanding, Beginning	280,836	220,596
Number of Options Granted	54,000	140,000
Number of Options Exercised	(76,665)	(74,360)
Number of Options Forfeited		(5,400)
Number of Options Outstanding, Ending	258,171	280,836
Range of Exercise Price Options Outstanding, Beginning	0.01 - $8.25	0.01 - $3.33
Range of Exercise Price Options Granted	9.26 - $13.49	7.76 - $8.25
Range of Exercise Price Options Exercised	0.01 - $7.76	0.01 - $3.33
Range of Exercise Price Options Forfeited		0.01 - $3.33
Range of Exercise Price Options Outstanding, Ending	0.01 - $13.49	0.01 - $8.25
Weighted Average Exercise Price Outstanding, Beginning	$ 4.97	$ 2.09
Weighted Average Exercise Price Granted	$ 12.39	$ 7.9
Weighted Average Exercise Price Exercised	$ 2.23	$ 2.14
Weighted Average Exercise Price Forfeited		$ 1.39
Weighted Average Exercise Price Outstanding, Ending	$ 7.32	$ 4.97
Aggregate Intrinsic Value Outstanding, Beginning	$ 1,340,684	$ 257,835
Aggregate Intrinsic Value Granted	$ 0	$ 0
Aggregate Intrinsic Value Exercised	646,266	405,738
Aggregate Intrinsic Value Forfeited		$ 15,256
Aggregate Intrinsic Value Outstanding, Ending	$ 608,570	$ 1,340,684