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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Inventory Write-down $ 1,777   $ 1,777
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 7,339,582 6,910,962  
Unrecognized Tax Benefits, Ending Balance $ 0   0
Safe Space Solutions [Member]      
Inventory Write-down $ 1,707   $ 1,707