Note 8. Stock Options and Restricted Stock Units (Details 4) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Number of restricted stock units outstanding, beginning	48,002	36,669
Number of restricted stock units granted	18,000	46,000
Number of restricted stock units vested/issued	(32,002)	(33,000)
Number of restricted stock units forfeited	(15,000)	(1,667)
Number of restricted stock units outstanding, ending	19,000	48,002
Weighted average exercise price outstanding, beginning	$ 11.55	$ 8.76
Weighted average exercise price granted	10.67	11.57
Weighted average exercise price vested/issued	11.61	8.62
Weighted average exercise price forfeited	11.35	8.85
Weighted average exercise price outstanding, ending	$ 10.78	$ 11.55
Aggregate intrinsic value outstanding, beginning	$ 554,388	$ 257,987
Aggregate intrinsic value granted	192,060	532,220
Aggregate intrinsic value vested/issued	353,948	400,700
Aggregate intrinsic value forfeited	156,665	14,753
Aggregate intrinsic value outstanding, ending	$ 332,690	$ 554,388