Note 8. Stock Options and Restricted Stock Units (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement [Abstract]
Number of options outstanding, beginning	98,563	137,288
Number of options granted	31,500	32,000
Number of options exercised	0	(61,875)
Number of options forfeited/cancelled	(2,500)	(8,850)
Number of options outstanding, ending	127,563	98,563
Range of exercise price options outstanding, beginning	6.80 - 17.40	0.01 - 13.49
Range of exercise price options granted	10.75 – 13.21	17.40
Range of exercise price options exercised	0	7.76 - 13.49
Range of exercise price options forfeited/cancelled	13.21	0.01 - 9.26
Range of exercise price options outstanding, ending	6.80 - 17.40	6.80 - 17.40
Weighted average exercise price outstanding, beginning	$ 12.56	$ 10.20
Weighted average exercise price granted	12.9	17.40
Weighted average exercise price exercised	0	11.46
Weighted average exercise price forfeited/cancelled	13.21	2.76
Weighted average exercise price outstanding, ending	$ 12.63	$ 12.56
Aggregate intrinsic value outstanding, beginning	$ 127,306	$ 1,119,562
Aggregate intrinsic value granted	$ 0	$ 0
Aggregate intrinsic value exercised	$ 0	$ 346,284
Aggregate intrinsic value forfeited/cancelled	$ 0	$ 134,009
Aggregate intrinsic value outstanding, ending	$ 142,818	$ 127,306