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Schedule of Basic and Diluted Per Share Computations for Continuing Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Numerator:                        
Net loss $ (25,787) $ (7,780) $ (7,354) $ (38,518) $ (8,093) $ (9,145) $ (2,544)     $ (40,921) $ (19,782)  
(Less) Net income (loss) attributable to non-controlling interest (1,831)       (903)         (2,027) 3,535  
Net loss attributable to Soluna Holdings, Inc. (23,956)       (7,190)         (38,894) (23,317)  
Less: Preferred dividends or deemed dividends (3,840)               (3,840) (452)  
Less: Cumulative Preferred Dividends in arrears (2,950)       (2,786)         (8,858) (7,117)  
Balance $ (30,746)       $ (9,976)         $ (51,592) $ (30,886)  
Basic and Diluted EPS:                        
Common shares outstanding, beginning of period, including penny warrants and excluding restricted stock awards not vested 8,106,814       2,592,454         8,106,814 2,592,454  
Weighted average common shares issued during the period including penny warrants issued and outstanding and excluding restricted stock awards not vested as of quarter-end 18,876,209       3,795,880         7,576,258 1,728,091  
Denominator for basic earnings per common shares 26,983,023 11,146,142,000 8,719,351,000   6,388,335 3,747,160,000   9,939,450,000 3,275,290,000 15,683,072 4,320,546 5,109,339,000
Denominator for diluted earnings per common shares 26,983,023 11,146,142,000 8,719,351,000   6,388,335 3,747,160,000   9,939,450,000 3,275,290,000 15,683,072 4,320,546 5,109,339,000
Basic loss per share $ (1.14) $ (0.93) $ (1.21)   $ (1.56) $ (3.62)   $ (2.10) $ (6.38) $ (3.29) $ (7.15) $ (14.94)
Diluted loss per share $ (1.14) $ (0.93) $ (1.21)   $ (1.56) $ (3.62)   $ (2.10) $ (6.38) $ (3.29) $ (7.15) $ (14.94)