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Note 13 - Subsequent Events (Details Textual) - USD ($)	Mar. 24, 2021	Mar. 24, 2021	Feb. 26, 2021	Jan. 06, 2021	May 21, 2020	Dec. 31, 2020	Dec. 31, 2019
Stock Issued During Period, Shares, New Issues (in shares)					1,085,000
Common Stock, Par or Stated Value Per Share (in dollars per share)					$ 0.001	$ 0.001	$ 0.001
Subsequent Event [Member] | March 2021 Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	80,000
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001	$ 0.001
Debt Instrument, Purchase Price Upon the Satisfaction of Conditions in the Agreement, Amount		$ 15,000,000
Subsequent Event [Member] | Senior Convertible Note Due in 2023 [Member]
Debt Instrument, Face Amount	$ 15,000,000	$ 15,000,000
Board of Directors Chairman [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, Issued for Services (in shares)				11,218
Stock Issued During Period, Value, Issued for Services				$ 70,000
Management [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, Issued for Services (in shares)			30,694
Stock Issued During Period, Value, Issued for Services			$ 166,667

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