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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
Conversion of Series F Preferred Stock into Common Stock [Member]
Preferred Stock [Member]
Series F Convertible Preferred Stock [Member]
Conversion of Series F Preferred Stock into Common Stock [Member]
Common Stock [Member]
Conversion of Series F Preferred Stock into Common Stock [Member]
Additional Paid-in Capital [Member]
Conversion of Series F Preferred Stock into Common Stock [Member]
AOCI Attributable to Parent [Member]
Conversion of Series F Preferred Stock into Common Stock [Member]
Retained Earnings [Member]
Conversion of Series F Preferred Stock into Common Stock [Member]
Conversions of Series G Preferred Stock Into Common Stock [Member]
Preferred Stock [Member]
Series G Convertible Preferred Stock [Member]
Conversions of Series G Preferred Stock Into Common Stock [Member]
Common Stock [Member]
Conversions of Series G Preferred Stock Into Common Stock [Member]
Additional Paid-in Capital [Member]
Conversions of Series G Preferred Stock Into Common Stock [Member]
AOCI Attributable to Parent [Member]
Conversions of Series G Preferred Stock Into Common Stock [Member]
Retained Earnings [Member]
Conversions of Series G Preferred Stock Into Common Stock [Member]
Series B Warrants [Member]
Preferred Stock [Member]
Series F Convertible Preferred Stock [Member]
Series B Warrants [Member]
Preferred Stock [Member]
Series G Convertible Preferred Stock [Member]
Series B Warrants [Member]
Common Stock [Member]
Series B Warrants [Member]
Additional Paid-in Capital [Member]
Series B Warrants [Member]
AOCI Attributable to Parent [Member]
Series B Warrants [Member]
Retained Earnings [Member]
Series B Warrants [Member]
Series F Warrants [Member]
Preferred Stock [Member]
Series F Convertible Preferred Stock [Member]
Series F Warrants [Member]
Preferred Stock [Member]
Series G Convertible Preferred Stock [Member]
Series F Warrants [Member]
Common Stock [Member]
Series F Warrants [Member]
Additional Paid-in Capital [Member]
Series F Warrants [Member]
AOCI Attributable to Parent [Member]
Series F Warrants [Member]
Retained Earnings [Member]
Series F Warrants [Member]
Conversion of Convertible Note Into Common Stock [Member]
Common Stock [Member]
Conversion of Convertible Note Into Common Stock [Member]
Additional Paid-in Capital [Member]
Conversion of Convertible Note Into Common Stock [Member]
AOCI Attributable to Parent [Member]
Conversion of Convertible Note Into Common Stock [Member]
Retained Earnings [Member]
Conversion of Convertible Note Into Common Stock [Member]
Preferred Stock [Member]
Series F Convertible Preferred Stock [Member]
Preferred Stock [Member]
Series G Convertible Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Series F Convertible Preferred Stock [Member]
Series G Convertible Preferred Stock [Member]
Total
Balance (in shares) at Dec. 31, 2024                                                               5,935 0 9,661,664            
Balance at Dec. 31, 2024                                                               $ 6 $ 0 $ 9,662 $ 212,715,967 $ (86,376) $ (218,381,218)     $ (5,741,959)
Issuance of Series F Preferred Stock and warrants (in shares)                                                               1,500 0 0            
Issuance of Series F Preferred Stock and warrants                                                               $ 1 $ 0 $ 0 1,499,999 0 0     1,500,000
Converted (in shares) (2,410)         (2,410)           0                                                        
Conversion to common stock $ (2)   $ (2,189)                                                                          
Conversion to common stock (in shares)   2,190,908                                                                            
Conversion to common stock   $ 2,191   $ 0 $ 0 $ 0                                                                    
Cashless exercise of Series F Warrants (in shares)                         0 0 267,849       267,849                                          
Cashless exercise of Series F Warrants                         $ 0 $ 0 $ 268 $ 520,565 $ 0 $ 0 $ 520,833                                          
Dividends on Series F Preferred Stock                                                               0 0 0 (67,651) 0 0     (67,651)
Conversion to common stock           $ (2,191)           $ 0                                                        
Warrants exercised                         $ 0 $ 0 $ 268 $ 520,565 $ 0 $ 0 $ 520,833                                          
Stock-based compensation expense                                                               0 0 0 49,880 0 0     49,880
Deemed dividends on Series F Preferred Stock and Series F Warrants                                                               0 0 0 1,056,332 0 (1,056,332)     0
Amortization of unrecognized periodic pension costs                                                               0 0 0 0 107,565 0     107,565
Foreign currency cumulative translation adjustment                                                               0 0 0 0 (21,779) 0     (21,779)
Net income                                                               $ 0 $ 0 $ 0 0 0 7,060,039     7,060,039
Conversion of Convertible Note (in shares)                                                     700,000       700,000                  
Conversion of Convertible Note                                                     $ 700 $ 769,300 $ 0 $ 0 $ 770,000                  
Balance (in shares) at Mar. 31, 2025                                                               5,025 0 12,820,421            
Balance at Mar. 31, 2025                                                               $ 5 $ 0 $ 12,821 216,542,203 (590) (212,377,511)     4,176,928
Balance (in shares) at Dec. 31, 2024                                                               5,935 0 9,661,664            
Balance at Dec. 31, 2024                                                               $ 6 $ 0 $ 9,662 212,715,967 (86,376) (218,381,218)     (5,741,959)
Balance (in shares) at Dec. 31, 2025                                                               4,122 6,190 43,613,800            
Balance at Dec. 31, 2025                                                               $ 4 $ 6 $ 43,614 266,736,538 191,185 (231,234,641)     35,736,706
Issuance of Series F Preferred Stock and warrants (in shares)                                                               500 0 0            
Issuance of Series F Preferred Stock and warrants                                                               $ 0 $ 0 $ 0 500,000 0 0     500,000
Converted (in shares) (2,759)         (2,759) (7,940)         (7,940)                                                        
Conversion to common stock $ (2)   $ (3,234)       $ (8)                                                                  
Conversion to common stock (in shares)   3,235,983           9,010,144                                                                
Conversion to common stock   $ 3,236   $ 0 $ 0 $ 0   $ 9,010   $ 0 $ 0 $ 0                                                        
Cashless exercise of Series F Warrants (in shares)                                       0 0 1,128,050       1,128,050           0 0 358,806            
Cashless exercise of Series F Warrants                                       $ 0 $ 0 $ 1,128 $ 960,647 $ 0 $ 0 $ 961,775           $ 0 $ 0 $ 359 (359) 0 0     0
Dividends on Series F Preferred Stock                                                               $ 0 $ 0 $ 0 (30,997) 0 0     (30,997)
Conversion to common stock           $ (3,236)     $ (9,002)     $ (9,010)                                                        
Shares issued (in shares)                                                               0 2,250 0       500 85,250  
Issuance of Series G Preferred Stock                                                               $ 0 $ 2 $ 0 2,249,998 0 0     2,250,000
Warrants exercised                                       $ 0 $ 0 $ 1,128 $ 960,647 $ 0 $ 0 $ 961,775           0 0 359 (359) 0 0     0
Stock-based compensation expense                                                               0 0 0 74,609 0 0     74,609
Deemed dividends on Series F Preferred Stock and Series F Warrants                                                               0 0 0 1,349,483 0 (1,349,483)     0
Issuance costs for sale of Series G Preferred Stock                                                               0 0 0 (167,500) 0 0     (167,500)
Amortization of unrecognized periodic pension costs                                                               0 0 0 0 346,908 0     346,908
Foreign currency cumulative translation adjustment                                                               0 0 0 0 (234,055) 0     (234,055)
Net income                                                               $ 0 $ 0 $ 0 0 0 1,420,362     1,420,362
Conversion of Convertible Note (in shares)                                                             0                  
Balance (in shares) at Mar. 31, 2026                                                               1,863 500 57,346,783            
Balance at Mar. 31, 2026                                                               $ 2 $ 0 $ 57,347 $ 271,660,183 $ 304,038 $ (231,163,762)     $ 40,857,808