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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Accounts receivable, allowance for doubtful accounts $ 3 $ 3
Inventory, allowance for excess and obsolete inventory and lower of cost or estimated net realizable value adjustments $ 229 $ 264
Preferred stock par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 150,000,000 150,000,000
Common stock, shares issued (in shares) 32,025,000 11,230,000
Common stock, shares outstanding (in shares) 32,025,000 11,230,000
Series B Preferred Stock [Member]    
Preferred stock, shares issued (in shares) 1,000 6,000
Preferred stock, shares outstanding (in shares) 1,000 6,000
Series C Preferred Stock [Member]    
Preferred stock, shares issued (in shares) 1,000 1,000
Preferred stock, shares outstanding (in shares) 1,000 1,000