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Note 10 - Debt Financing (Details Textual) - USD ($) $ in Thousands | Jun. 30, 2022 | Jan. 08, 2021 | Apr. 17, 2020
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Percentage of Face Amount of Letters of Credit As Collateral | 150.00% |  |
Payment, Basis Points on Face Value of Letters of Credit | 2.50% |  |
Letters of Credit Outstanding, Amount | $ 1,326 |  |
Paycheck Protection Program CARES Act [Member] |  |  |
Proceeds from Issuance of Long-term Debt, Total |  |  | $ 1,556
Debt Instrument, Decrease, Forgiveness |  | $ 1,556 |
Asset Pledged as Collateral [Member] |  |  |
Investments, Total | $ 1,990 |  |

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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 https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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