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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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