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Note 10 - Debt Financing (Details Textual) - Paycheck Protection Program CARES Act [Member] - USD ($) $ in Thousands |  |  | 9 Months Ended
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Jan. 08, 2021 | Apr. 17, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Proceeds from Issuance of Long-term Debt, Total |  | $ 1,556 | $ 0 | $ 1,556
Debt Instrument, Decrease, Forgiveness | $ 1,556 |  |  |

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- Definition Decrease for amounts of indebtedness forgiven by the holder of the debt instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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- Details
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