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Note 4 - Earnings Per Share - Basic and Diluted (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Net income |  | $ 9,184,965 | $ 6,373,489
Basic earnings (loss) per common share (in dollars per share) (in dollars per share) |  | $ 0.70 | $ 0.54
Diluted earnings (loss) per common share (in dollars per share) (in dollars per share) |  | $ 0.68 | $ 0.53
Weighted average common shares outstanding (in shares) | [1] | 13,133,382 | 11,793,620
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan (in shares) | [2] | 355,035 | 160,329
Weighted average common and common equivalent shares outstanding (in shares) |  | 13,488,417 | 11,953,949
[1] | The increase in weighted average common shares outstanding from 2014 to 2015 was primarily due to the common stock issuance discussed in Note 16 to the Consolidated Financial Statements. The increase in weighted average common shares outstanding from 2015 to 2016 was primarily due to the common stock issuance discussed in Note 2 to the Consolidated Financial Statements.
[2] | Excludes anti-dilutive shares of 17,739, 36,572, and 124,983 at December 31, 2016, 2015 and 2014, respectively.

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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