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Note 11 - Debt Financing (Details Textual) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 08, 2021 | Apr. 17, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 19, 2019
The BMO Harris Agreement [Member] |  |  |  |  |
Debt Instrument, Cash Collateral, Percentage Of Face Amount Of Outstanding Debt |  |  |  |  | 105.00%
Letters of Credit Outstanding, Amount |  |  | $ 1,104 |  |
Restricted Cash, Total |  |  | 1,161 |  |
The BMO Harris Agreement [Member] | Standby Letters of Credit [Member] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 2.50%
Paycheck Protection Program CARES Act [Member] |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  | $ 1,556 | $ 0 | $ 1,556 |
Debt Instrument, Decrease, Forgiveness | $ 1,556 |  |  |  |

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- Definition The percentage of cash collateral to face amount of outstanding debt pursuant to the debt agreement. + References No definition available. + Details
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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 Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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