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Note 11 - Selected Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2021
Notes to Financial Statements |
Quarterly Financial Information [Text Block] | 11. Selected Quarterly Financial Data (Unaudited) Selected Quarterly Financial Data (Unaudited) for the year ended December 31, 2021 and 2020 is presented below (in thousands except per share data):
2021 |  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |
Loss from operations |  | $ | (3,553 | ) |  | $ | (10,605 | ) |  | $ | (3,731 | ) |  | $ | (7,193 | )
Net loss |  |  | (2,568 | ) |  |  | (5,118 | ) |  |  | (3,261 | ) |  |  | (6,467 | )
Net loss per share—basic and diluted |  |  | (0.09 | ) |  |  | (0.17 | ) |  |  | (0.11 | ) |  |  | (0.21 | )
2020 |  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |
Loss from operations |  | $ | (2,171 | ) |  | $ | (6,514 | ) |  | $ | (4,670 | ) |  | $ | (4,922 | )
Net loss |  |  | (14 | ) |  |  | (6,844 | ) |  |  | (2,526 | ) |  |  | (1,838 | )
Net loss per share—basic and diluted |  |  | (0.00 | ) |  |  | (0.24 | ) |  |  | (0.09 | ) |  |  | (0.06 | )

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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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=124502072&loc=SL124452896-108306 + Details
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