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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Inventory Valuation Reserves $ 192 $ 192   $ 1,777
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)   7,391,651 7,490,962  
Unrecognized Tax Benefits, Ending Balance 0 $ 0   $ 0
Safe Space Solutions [Member]        
Inventory Write-down $ 1,707