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Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Restricted Cash, Total | $ 9,200 | $ 200
Letters of Credit Outstanding, Amount | 6,500 |
Tax Increment Revenue Bonds [Member] |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Ending Balance | $ 0 |
Guaranty for Payment of Debt Service Shortfalls, Threshold, Coverage Rate | 53.7 |
Guarantor Obligations, Current Carrying Value | $ 5,000 |
Investment Cash Held as Collateral for Letters of Credit [Member] |  |
Restricted Cash, Total | $ 6,500 |

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