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Note 12 - Convertible Note (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	Mar. 26, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Proceeds from Convertible Debt		$ 0	$ 0	$ 2,000
Iliad Research and Trading, L.P. [Member] | Secured Convertible Promissory Note [member]
Debt Instrument, Face Amount	$ 2,200
Debt Instrument, Interest Rate, Stated Percentage	10.00%
Proceeds from Convertible Debt	$ 2,000
Debt Instrument, Original Issue Discount	200
Debt Instrument, Fee Amount	15
Deferred Finance Costs Excluding Transaction Fees	$ 200
Debt Instrument, Interest Rate During Period			20.00%
Interest Expense, Debt, Total			$ 200

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