Note 8. Stock Options and Restricted Stock Units (Details 3) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Note 8. Stock Options And Restricted Stock Units Details 3
Number of restricted stock units outstanding, beginning	126,500	108,000
Number of restricted stock units granted	17,500	88,500
Number of restricted stock units vested/issued	(69,170)	(55,000)
Number of restricted stock units forfeited	(9,665)	(15,000)
Number of restricted stock units outstanding, ending	65,165	126,500
Weighted average exercise price outstanding, beginning	$ 6.35	$ 7.76
Weighted average exercise price granted	10.75	5.28
Weighted average exercise price vested/issued	6.95	7.32
Weighted average exercise price forfeited	7.88	6.61
Weighted average exercise price outstanding, ending	$ 6.66	$ 6.35
Aggregate intrinsic value outstanding, beginning	$ 1,138,500	$ 626,400
Aggregate intrinsic value granted	104,000	467,300
Aggregate intrinsic value vested/issued	799,563	379,588
Aggregate intrinsic value forfeited	106,330	111,941
Aggregate intrinsic value outstanding, ending	$ 1,111,703	$ 1,138,500