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Note 15 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Allocated Share-based Compensation Expense | $ 1,187,035 | $ 947,174 | $ 941,469
Employee Stock Option [Member] |  |  |
Allocated Share-based Compensation Expense | 554,435 | 424,904 | 393,114
Restricted Stock [Member] |  |  |
Allocated Share-based Compensation Expense | 552,907 | 460,853 | 492,410
Employee Stock Purchase Plan [Member] |  |  |
Allocated Share-based Compensation Expense | $ 79,694 | $ 61,417 | $ 55,945

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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