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Note 8. Stock Options and Restricted Stock Units (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Notes to Financial Statements |  |
Number of options outstanding, beginning | 163,850 | 246,000
Number of options granted | 32,000 | 0
Number of options exercised | (56,645) | (20,900)
Number of options forfeited/cancelled | (1,917) | (61,250)
Number of options outstanding, ending | 137,288 | 163,850
Range of exercise price options outstanding, beginning | 0.01 - 13.49 | 0.01 - 13.49
Range of exercise price options granted | 13.00 | 0.00
Range of exercise price options exercised | 0.01 - 9.26 | 0.01 - 3.33
Range of exercise price options forfeited/cancelled | 9.26 | 7.76 - 9.26
Range of exercise price options outstanding, ending | 0.01 - 13.49 | 0.01 - 13.49
Weighted average exercise price outstanding, beginning | $ 8.30 | $ 7.69
Weighted average exercise price granted | 13.00 | 0.00
Weighted average exercise price exercised | 6.32 | 1.67
Weighted average exercise price forfeited/cancelled | 9.26 | 8.11
Weighted average exercise price outstanding, ending | $ 10.20 | $ 8.30
Aggregate intrinsic value outstanding, beginning | $ 297,542 | $ 187,798
Aggregate intrinsic value granted | $ 0 | $ 0
Aggregate intrinsic value exercised | $ 393,729 | $ 89,180
Aggregate intrinsic value forfeited/cancelled | $ 3,984 | $ 0
Aggregate intrinsic value outstanding, ending | $ 1,119,562 | $ 297,542

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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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