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Note 8 - Notes Payable (Details Textual) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 17, 2020 | Apr. 30, 2020 | Apr. 22, 2020 | Jan. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020 | Sep. 01, 2020 | Sep. 17, 2019
Amortization of Debt Issuance Costs |  |  |  |  | $ 1,287,430 | $ 965,239 |  |  |
Payments of Extension Costs on Note Payable |  |  |  |  | 351,025 | $ (0) |  |  |
Economic Injury Disaster Loan [Member] |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Unsecured Debt | $ 200,000 |  | $ 10,000 |  |  |  |  |  |
Economic Injury Disaster Loan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Decrease, Forgiveness |  |  |  | $ 10,000 |  |  |  |  |
Economic Injury Disaster Loan [Member] | Accounts Payable and Accrued Liabilities [Member] |  |  |  |  |  |  |  |  |
Unsecured Debt, Total |  |  |  |  | 10,000 |  |  |  |
SBA CARES Act Paycheck Protection Program [Member] |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Unsecured Debt |  | $ 500,000 |  |  |  |  |  |  |
Polar Multi-Strategy Master Fund [Member] | Notes Payable to Banks [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 14,000,000.0
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 8.00%
Long-term Debt, Total |  |  |  |  | 7,700,000 |  |  | $ 8,800,000 |
Debt Instrument, Renewal Fee Percentage |  |  |  |  |  |  | 4.00% |  | 4.00%
Repayments of Notes Payable, Including Interest |  |  |  |  | 6,300,000 |  |  |  |
Debt Instrument, Unamortized Discount, Total |  |  |  |  | 0 |  |  |  | $ 1,400,000
Accretion Expense |  |  |  |  | 1,000,000.0 |  |  |  |
Debt Issuance Costs, Gross |  |  |  |  |  |  |  |  | $ 1,100,000
Amortization of Debt Issuance Costs |  |  |  |  | 900,000 |  |  |  |
Payments of Extension Costs on Note Payable |  |  |  |  | 400,000 |  |  |  |
Amortization of Extension Costs on Notes Payable |  |  |  |  | $ 200,000 |  |  |  |
Debt Instrument, Covenant, Debt to Property Fair Value Ratio |  |  |  |  |  |  |  |  | 75.00%

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