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Note 18 - Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2019
Notes to Financial Statements |
Quarterly Financial Information [Text Block] | 18. Quarterly Financial Data (Unaudited)
|  | Quarter ended |  | Quarter ended |  | Quarter ended |  | Quarter ended
Year 2019 |  | December 31 |  | September 30 |  | June 30 |  | March 31
Product revenue |  | $ | 29,767 |  |  | $ | 29,615 |  |  | $ | 30,413 |  |  | $ | 24,717 |
Total revenue |  |  | 29,772 |  |  |  | 29,697 |  |  |  | 30,418 |  |  |  | 24,723 |
Cost of product revenue |  |  | 8,649 |  |  |  | 5,951 |  |  |  | 6,836 |  |  |  | 7,311 |
Gross profit on product revenue |  |  | 21,118 |  |  |  | 23,664 |  |  |  | 23,577 |  |  |  | 17,406 |
Net income |  | $ | 4,051 |  |  | $ | 9,200 |  |  | $ | 9,435 |  |  | $ | 4,507 |
Per common share information: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per share |  | $ | 0.28 |  |  | $ | 0.65 |  |  | $ | 0.68 |  |  | $ | 0.32 |
Basic common shares outstanding |  |  | 14,280 |  |  |  | 14,070 |  |  |  | 13,916 |  |  |  | 14,185 |
Diluted net income per share |  | $ | 0.28 |  |  | $ | 0.66 |  |  | $ | 0.67 |  |  | $ | 0.31 |
Diluted common shares outstanding |  |  | 14,621 |  |  |  | 14,387 |  |  |  | 14,088 |  |  |  | 14,314 |
|  | Quarter ended |  | Quarter ended |  | Quarter ended |  | Quarter ended
Year 2018 |  | December 31 |  | September 30 |  | June 30 |  | March 31
Product revenue |  | $ | 26,950 |  |  | $ | 26,781 |  |  | $ | 30,542 |  |  | $ | 21,258 |
Total revenue |  |  | 26,956 |  |  |  | 26,787 |  |  |  | 30,548 |  |  |  | 21,264 |
Cost of product revenue |  |  | 7,001 |  |  |  | 8,282 |  |  |  | 8,152 |  |  |  | 7,845 |
Gross profit on product revenue |  |  | 19,949 |  |  |  | 18,499 |  |  |  | 22,390 |  |  |  | 13,413 |
Net income |  | $ | 7,717 |  |  | $ | 7,599 |  |  | $ | 10,092 |  |  | $ | (6,686 | )
Per common share information: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per share |  | $ | 0.54 |  |  | $ | 0.53 |  |  | $ | 0.69 |  |  | $ | (0.46 | )
Basic common shares outstanding |  |  | 14,168 |  |  |  | 14,237 |  |  |  | 14,652 |  |  |  | 14,679 |
Diluted net income per share |  | $ | 0.54 |  |  | $ | 0.53 |  |  | $ | 0.68 |  |  | $ | (0.46 | )
Diluted common shares outstanding |  |  | 14,299 |  |  |  | 14,377 |  |  |  | 14,915 |  |  |  | 14,679 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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