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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
Mar. 31, 2025
Dec. 31, 2024
Allowance on accounts receivable $ 144,000 $ 123,000
Property, plant and equipment, accumulated depreciation 29,119,000 28,897,000
Intangible assets - accumulated amortization $ 35,180,000 $ 33,558,000
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) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 150,000,000 150,000,000
Common stock, shares issued (in shares) 15,007,437 14,990,712
Common stock, shares outstanding (in shares) 15,007,437 14,990,712
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 issued (in shares) 25,000 25,000
Preferred stock, shares outstanding (in shares) 25,000 25,000
Preferred stock, liquidation preference $ 39,256,000 $ 39,256,000