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Note 8. Stock Options and Restricted Stock Units (Details 3) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |
Number of restricted stock units outstanding, beginning | 65,165 | 126,500
Number of restricted stock units granted | 9,000 | 17,500
Number of restricted stock units vested/issued | (34,996) | (69,170)
Number of restricted stock units forfeited | (2,500) | (9,665)
Number of restricted stock units outstanding, ending | 36,669 | 65,165
Weighted average exercise price outstanding, beginning | $ 6.66 | $ 6.35
Weighted average exercise price granted | 17.43 | 10.75
Weighted average exercise price vested/issued | 7.28 | 6.95
Weighted average exercise price forfeited | 5.80 | 7.88
Weighted average exercise price outstanding, ending | $ 8.76 | $ 6.66
Aggregate intrinsic value outstanding, beginning | $ 1,111,703 | $ 1,138,500
Aggregate intrinsic value granted | 156,850 | 104,000
Aggregate intrinsic value vested/issued | 850,984 | 799,563
Aggregate intrinsic value forfeited | 43,329 | 106,330
Aggregate intrinsic value outstanding, ending | $ 257,987 | $ 1,111,703

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