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Note 8. Stock Options and Restricted Stock Units (Details 4) - USD ($) | 12 Months Ended
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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

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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