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Note 19 - Quarterly Results of Operations (Unaudited) - Quarterly Results of Operations (Unaudited) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Total interest income | $ 37,878,086 | $ 33,840,865 | $ 32,453,268 | $ 31,345,099 | $ 32,235,657 | $ 26,816,735 | $ 23,913,284 | $ 23,502,059 |  |  |
Total interest expense | 6,084,733 | 5,284,517 | 4,406,571 | 3,676,216 | 2,955,992 | 3,185,958 | 2,904,471 | 2,904,537 | $ 19,452,037 | $ 11,950,958 | $ 13,706,529
Net interest income | 31,793,353 | 28,556,348 | 28,046,697 | 27,668,883 | 29,279,665 | 23,630,777 | 21,008,813 | 20,597,522 | 116,065,281 | 94,516,777 | 76,296,724
Provision for loan/lease losses | 2,255,381 | 2,086,436 | 2,022,993 | 2,105,109 | 2,599,345 | 1,607,986 | 1,197,850 | 2,072,985 | 8,469,919 | 7,478,166 | 6,870,900
Noninterest income | 9,714,717 | 6,701,303 | 6,782,518 | 7,283,754 | 7,028,600 | 10,423,401 | 6,762,401 | 6,822,473 | 30,482,292 | 31,036,875 | 24,363,321
Noninterest expense | 31,351,204 | 23,395,747 | 21,404,629 | 21,273,117 | 22,307,178 | 24,480,483 | 17,743,753 | 16,954,498 | 97,424,697 | 81,485,912 | 73,192,022
Income before taxes | 7,901,485 | 9,775,468 | 11,401,593 | 11,574,411 | 11,401,742 | 7,965,709 | 8,829,611 | 8,392,512 | 40,652,957 | 36,589,574 | 20,597,123
Income Tax Expense (Benefit) | (2,000,105) | 1,921,533 | 2,635,576 | 2,389,446 | 2,872,412 | 1,858,208 | 2,153,144 | 2,019,023 | 4,946,450 | 8,902,787 | 3,669,242
Net income (loss) | $ 9,901,590 | $ 7,853,935 | $ 8,766,017 | $ 9,184,965 | $ 8,529,330 | $ 6,107,501 | $ 6,676,467 | $ 6,373,489 | $ 35,706,507 | $ 27,686,787 | $ 16,927,881
Basic (in dollars per share) | $ 0.72 | $ 0.60 | $ 0.67 | $ 0.70 | $ 0.65 | $ 0.47 | $ 0.54 | $ 0.54 | $ 2.68 | $ 2.20 | $ 1.64
Diluted (in dollars per share) | $ 0.70 | $ 0.58 | $ 0.65 | $ 0.68 | $ 0.64 | $ 0.46 | $ 0.53 | $ 0.53 | $ 2.61 | $ 2.17 | $ 1.61

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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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