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Note 18 - Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Quarterly Financial Information [Text Block] | 18. Quarterly Financial Data (Unaudited)
|  | Quarter ended |  | Quarter ended |  | Quarter ended |  | Quarter ended
Year 2017 |  | December 31 |  | September 30 |  | June 30 |  | March 31
Product revenue |  | $ | 28,884 |  |  | $ | 27,178 |  |  | $ | 28,340 |  |  | $ | 23,381 |
Total revenue |  |  | 29,388 |  |  |  | 27,184 |  |  |  | 33,462 |  |  |  | 23,386 |
Cost of product revenue |  |  | 8,716 |  |  |  | 6,250 |  |  |  | 6,315 |  |  |  | 6,083 |
Gross profit on product revenue |  |  | 20,168 |  |  |  | 20,928 |  |  |  | 22,025 |  |  |  | 17,298 |
Net income |  | $ | 8,067 |  |  | $ | 6,887 |  |  | $ | 11,369 |  |  | $ | 5,493 |
Per common share information: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per share |  | $ | 0.55 |  |  | $ | 0.47 |  |  | $ | 0.78 |  |  | $ | 0.38 |
Basic common shares outstanding |  |  | 14,596 |  |  |  | 14,579 |  |  |  | 14,588 |  |  |  | 14,576 |
Diluted net income per share |  | $ | 0.53 |  |  | $ | 0.46 |  |  | $ | 0.76 |  |  | $ | 0.37 |
Diluted common shares outstanding |  |  | 15,141 |  |  |  | 15,115 |  |  |  | 15,044 |  |  |  | 15,043 |
|  | Quarter ended |  | Quarter ended |  | Quarter ended |  | Quarter ended
Year 2016 |  | December 31 |  | September 30 |  | June 30 |  | March 31
Product revenue |  | $ | 28,296 |  |  | $ | 25,783 |  |  | $ | 26,575 |  |  | $ | 22,278 |
Total revenue |  |  | 28,726 |  |  |  | 25,789 |  |  |  | 26,581 |  |  |  | 22,283 |
Cost of product revenue |  |  | 7,539 |  |  |  | 4,998 |  |  |  | 6,065 |  |  |  | 5,425 |
Gross profit on product revenue |  |  | 20,757 |  |  |  | 20,785 |  |  |  | 20,510 |  |  |  | 16,853 |
Net income |  | $ | 8,085 |  |  | $ | 8,952 |  |  | $ | 8,615 |  |  | $ | 6,895 |
Per common share information: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per share |  | $ | 0.56 |  |  | $ | 0.61 |  |  | $ | 0.59 |  |  | $ | 0.46 |
Basic common shares outstanding |  |  | 14,538 |  |  |  | 14,625 |  |  |  | 14,679 |  |  |  | 14,875 |
Diluted net income per share |  | $ | 0.54 |  |  | $ | 0.59 |  |  | $ | 0.57 |  |  | $ | 0.45 |
Diluted common shares outstanding |  |  | 14,979 |  |  |  | 15,077 |  |  |  | 15,111 |  |  |  | 15,307 |

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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