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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Allowance on accounts receivable $ 123,000 $ 617,000
Property, plant and equipment, accumulated depreciation 28,897,000 27,513,000
Intangible assets - accumulated amortization $ 33,558,000 $ 31,444,000
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 2,000,000 2,000,000
Common stock, par value (in dollars per share) [1] $ 0.001 $ 0.001
Common stock, shares authorized (in shares) [1] 150,000,000 150,000,000
Common stock, shares issued (in shares) [1] 14,990,712 11,878,557
Common stock, shares outstanding (in shares) [1] 14,990,712 11,878,557
Series E Preferred Stock    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 39,500 39,500
Preferred stock, shares issued (in shares) 25,000 25,000
Preferred stock, shares outstanding (in shares) 25,000 25,000
Aggregate liquidation preference $ 38,392,444  
[1] Adjusted retroactively for reverse stock split that occurred on January 24, 2024, see Note 1