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Note 8. Stock Options and Restricted Stock Units (Details 3) - USD ($) | 12 Months Ended
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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

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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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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