Amount of accumulated undistributed earnings (deficit).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	May 11, 2023	May 10, 2023	Mar. 31, 2023 USD ($)	Jan. 01, 2023 USD ($)	Dec. 31, 2022 USD ($)
Retained Earnings (Accumulated Deficit)			$ (234,310)		$ (224,105)
Accounting Standards Update 2016-13 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings (Accumulated Deficit)				$ (500)
Reverse Stock Split [Member] \| Subsequent Event [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	15
Reverse Stock Split [Member] \| Minimum [Member] \| Subsequent Event [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio		5
Reverse Stock Split [Member] \| Maximum [Member] \| Subsequent Event [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio		15