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Note 8 - Stockholders' Equity | 6 Months Ended
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Jun. 30, 2020
Notes to Financial Statements |
Stockholders' Equity Note Disclosure [Text Block] | 8. Stockholders’ Equity Common Stock The Company had reserved shares of common stock for issuance as follows:
|  | June 30, 2020 |  |  | December 31, 2019 |
Stock options and restricted stock units issued and outstanding |  |  | 5,534,822 |  |  |  | 5,562,484 |
Stock options and restricted stock units available for grant under stock option plans |  |  | 3,207,661 |  |  |  | 1,954,804 |
Common stock available for the Employee Stock Purchase Plan |  |  | 112,226 |  |  |  | 173,168 |
Total |  |  | 8,854,709 |  |  |  | 7,690,456 |

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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