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Note 20 - Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] |
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 Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: 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 + Details
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