Note 8. Stock Options and Restricted Stock Units (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Notes to Financial Statements
Number of Options Outstanding, Beginning	258,171	280,836
Number of Options Granted	10,000	54,000
Number of Options Exercised	(20,671)	(76,665)
Number of Options Forfeited	(1,500)
Number of Options Outstanding, Ending	246,000	258,171
Range of Exercise Price Options Outstanding, Beginning	0.01 - $13.49	0.01 - $8.25
Range of Exercise Price Options Granted	6.80	9.26 - $13.49
Range of Exercise Price Options Exercised	0.01 - $2.81	0.01 - $7.76
Range of Exercise Price Options Forfeited	9.26
Range of Exercise Price Options Outstanding, Ending	0.01 - $13.49	0.01 - $13.49
Weighted Average Exercise Price Outstanding, Beginning	$ 7.32	$ 4.97
Weighted Average Exercise Price Granted	6.80	12.39
Weighted Average Exercise Price Exercised	2.55	2.23
Weighted Average Exercise Price Forfeited	9.26
Weighted Average Exercise Price Outstanding, Ending	$ 7.69	$ 7.32
Aggregate Intrinsic Value Outstanding, Beginning	$ 608,570	$ 1,340,684
Aggregate Intrinsic Value Granted	$ 0	$ 0
Aggregate Intrinsic Value Exercised	$ 106,868	$ 646,266
Aggregate Intrinsic Value Forfeited	$ 0
Aggregate Intrinsic Value Outstanding, Ending	$ 187,798	$ 608,570