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Note 2 - Significant Accounting Policies - Earnings Per Share (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net income | $ 2,059,997 | $ 1,000,350 | $ 1,820,915 | $ 1,520,997 | $ 2,338,758 | $ 1,111,344 | $ 1,507,896 | $ 1,444,407 | $ 6,402,259 | $ 6,402,405 | $ 7,706,921
Weighted average common shares outstanding (in shares) | 9,188,483 | 9,188,483 | 9,209,446 | 9,698,951 | 9,692,860 | 10,175,650 | 10,212,933 | 10,211,333 | 9,301,867 | 10,077,506 | 10,203,063
Earnings per share – basic (in dollars per share) | $ 0.23 | $ 0.11 | $ 0.19 | $ 0.16 | $ 0.24 | $ 0.11 | $ 0.15 | $ 0.14 | $ 0.69 | $ 0.64 | $ 0.76
DILUTED |  |  |  |  |  |  |  |  |  |  |
Net income | $ 2,059,997 | $ 1,000,350 | $ 1,820,915 | $ 1,520,997 | $ 2,338,758 | $ 1,111,344 | $ 1,507,896 | $ 1,444,407 | $ 6,402,259 | $ 6,402,405 | $ 7,706,921
Weighted average common shares outstanding (in shares) | 9,188,483 | 9,188,483 | 9,209,446 | 9,698,951 | 9,692,860 | 10,175,650 | 10,212,933 | 10,211,333 | 9,301,867 | 10,077,506 | 10,203,063
Effect of restricted stock awards and assumed exercise of stock options (in shares) |  |  |  |  |  |  |  |  | 19,691 | 25,254 | 38,058
Weighted average common shares outstanding, assuming dilution (in shares) | 9,301,867 | 9,206,382 | 9,227,941 | 9,718,453 | 9,712,571 | 10,199,092 | 10,241,164 | 10,241,096 | 9,321,558 | 10,102,760 | 10,241,121
Earnings per share - diluted (in dollars per share) | $ 0.23 | $ 0.11 | $ 0.19 | $ 0.16 | $ 0.24 | $ 0.11 | $ 0.15 | $ 0.14 | $ 0.69 | $ 0.63 | $ 0.75
Outstanding options and restricted stock awards excluded as anti-dilutive (in shares) |  |  |  |  |  |  |  |  | 31,477 | 60,433 |

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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=65016374&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=64863997&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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