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Note 8 - Notes Payable (Details Textual) - USD ($)				1 Months Ended	3 Months Ended		12 Months Ended
	Aug. 17, 2020	Apr. 30, 2020	Apr. 22, 2020	Jan. 31, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Sep. 30, 2020	Sep. 01, 2020	Sep. 17, 2019
Gain (Loss) on Extinguishment of Debt, Total					$ 10,000	$ 0
Economic Injury Disaster Loan [Member]
Proceeds from Issuance of Unsecured Debt	$ 150,000		$ 10,000
Debt Instrument, Decrease, Forgiveness				$ 10,000
Gain (Loss) on Extinguishment of Debt, Total					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		$ 0			$ 1,400,000
Debt Issuance Costs, Gross										$ 1,100,000

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The percentage of renewal fee of the debt instrument.

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Decrease for amounts of indebtedness forgiven by the holder of the debt instrument.

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