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Note 20 - Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information [Text Block] | 20. Quarterly Financial Data (Unaudited)
Year 2014 |  | Quarter ended December 31, |  |  | Quarter ended September 30, |  |  | Quarter ended June 30, |  |  | Quarter ended March 31, |
Product revenue |  | $ | 17,880,125 |  |  | $ | 21,975,312 |  |  | $ | 21,267,156 |  |  | $ | 14,351,405 |
Total revenue |  |  | 23,254,469 |  |  |  | 22,055,423 |  |  |  | 26,274,660 |  |  |  | 34,010,287 |
Cost of product revenue |  |  | 5,511,586 |  |  |  | 5,724,800 |  |  |  | 5,332,913 |  |  |  | 4,361,019 |
Gross profit on product revenue |  |  | 12,368,539 |  |  |  | 16,250,512 |  |  |  | 15,934,243 |  |  |  | 9,990,386 |
Net income |  | $ | 7,816,076 |  |  | $ | 6,170,800 |  |  | $ | 9,302,350 |  |  | $ | 15,030,253 |
Per common share information: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per share |  | $ | 0.53 |  |  | $ | 0.42 |  |  | $ | 0.63 |  |  | $ | 1.04 |
Basic common shares outstanding |  |  | 14,800,813 |  |  |  | 14,758,781 |  |  |  | 14,687,747 |  |  |  | 14,461,367 |
Diluted net income per share |  | $ | 0.51 |  |  | $ | 0.40 |  |  | $ | 0.60 |  |  | $ | 0.97 |
Diluted common shares outstanding |  |  | 15,277,583 |  |  |  | 15,434,875 |  |  |  | 15,492,732 |  |  |  | 15,499,447 |
Year 2013 |  | Quarter ended December 31, |  |  | Quarter ended September 30, |  |  | Quarter ended June 30, |  |  | Quarter ended March 31, |
Product revenue |  | $ | 20,188,488 |  |  | $ | 17,023,346 |  |  | $ | 20,067,407 |  |  | $ | 14,494,489 |
Total revenue |  |  | 21,251,328 |  |  |  | 17,754,438 |  |  |  | 20,828,377 |  |  |  | 15,247,011 |
Cost of product revenue |  |  | 6,235,334 |  |  |  | 5,377,568 |  |  |  | 6,311,332 |  |  |  | 4,841,170 |
Gross profit on product revenue |  |  | 13,953,154 |  |  |  | 11,645,778 |  |  |  | 13,756,075 |  |  |  | 9,653,319 |
Net income |  | $ | 6,654,369 |  |  | $ | 4,957,258 |  |  | $ | 5,894,892 |  |  | $ | 3,068,002 |
Per common share information: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per share |  | $ | 0.47 |  |  | $ | 0.36 |  |  | $ | 0.44 |  |  | $ | 0.23 |
Basic common shares outstanding |  |  | 14,272,606 |  |  |  | 13,682,449 |  |  |  | 13,510,573 |  |  |  | 13,406,952 |
Diluted net income per share |  | $ | 0.44 |  |  | $ | 0.33 |  |  | $ | 0.40 |  |  | $ | 0.21 |
Diluted common shares outstanding |  |  | 15,084,738 |  |  |  | 14,958,965 |  |  |  | 14,578,927 |  |  |  | 14,357,110 |

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=35737889&loc=d3e1280-108306 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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