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Note 3 - Acquisitions - Pro Forma Information (Details) - eNom, Incorporated [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Net revenues | $ 333,882,963 | $ 338,591,378
Net income | $ 21,954,421 | $ 2,175,915
Basic earnings per common share (in dollars per share) | $ 2.09 | $ 0.21
Diluted earnings per common share (in dollars per share) | $ 2.04 | $ 0.21

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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