Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Basis of Presentation, Principles of Consolidation, Significant Accounting Policies and Liquidity (Details Textual)

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Note 2 - Basis of Presentation, Principles of Consolidation, Significant Accounting Policies and Liquidity (Details Textual)
$ in Thousands, shares in Millions
3 Months Ended
Jan. 29, 2021
Mar. 31, 2021
USD ($)
shares
Mar. 31, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
Net Income (Loss) Attributable to Parent, Total   $ (4,445) $ (1,209)  
Net Cash Provided by (Used in) Operating Activities, Total   (3,624) $ (4,342)  
Retained Earnings (Accumulated Deficit), Ending Balance   (61,361)   $ (56,916)
Cash and Cash Equivalents, at Carrying Value, Ending Balance   $ 86,293   $ 15,173
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares   3.8 3.1  
Reverse Stock Split [Member]        
Stockholders' Equity Note, Stock Split, Conversion Ratio 6