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Note 7 - Convertible Promissory Note (Details Textual) - USD ($)		12 Months Ended
	Jul. 23, 2019	Dec. 31, 2022	Dec. 31, 2021	Jan. 31, 2023	Oct. 31, 2022	Jul. 25, 2022
Amortization of Debt Discount (Premium)		$ 3,487,000	$ 3,631,000
Convertible Debt [Member] \| The July 2019 Note [Member]
Debt Instrument, Face Amount	$ 1,000,000	$ 1,000,000	$ 1,000,000
Debt Instrument, Convertible, Conversion Price	$ 81.00	$ 6.30	$ 40.95		$ 6.30	$ 9.45
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger	90.00%
Debt Instrument, Interest Rate, Stated Percentage	24.00%	24.00%	24.00%
Debt Instrument, Unamortized Discount, Total		$ 38,000	$ 187,000		$ 112,000
Amortization of Debt Discount (Premium)		74,000	321,000
Interest Expense, Debt, Total		240,000	240,000
Interest Payable		$ 120,000	$ 60,000
Convertible Debt [Member] \| The July 2019 Note [Member] \| Subsequent Event [Member]
Debt Instrument, Convertible, Conversion Price				$ 2.87
Convertible Debt [Member] \| The July 2019 Note [Member] \| Minimum [Member]
Debt Instrument, Convertible, Conversion Price	$ 22.50