v3.26.1
Note 1 - Organization (Details Textual)
 3 Months Ended 6 Months Ended
Aug. 04, 2025
Jun. 30, 2026
USD ($)
$ / shares
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
shares
Dec. 31, 2025
USD ($)
$ / shares
Oct. 16, 2025
USD ($)
$ / shares
May 15, 2025
USD ($)
Aug. 22, 2024
USD ($)
Net Income (Loss) Attributable to Parent   $ (4,480,000) $ (6,770,000) $ (8,434,000) $ (15,085,000)        
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation       (6,474,000) (5,299,000)        
Cash and Cash Equivalent   4,744,000   4,744,000   $ 10,810,000      
Working Capital   4,047,000   4,047,000          
Retained Earnings (Accumulated Deficit)   (278,850,000)   (278,850,000)   $ (270,416,000)      
Gain Loss on Sale of Property, Plant and Equipment, Excluding Amount in Cost of Good Sold   $ (0) $ (3,765,000) $ (0) $ (9,012,000)        
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares   $ 0.001   $ 0.001   $ 0.001 $ 0.001    
The 2026 ESPP [Member]                  
Stock Issued During Period, Shares, New Issues (in shares) | shares       131,569          
Proceeds from Issuance of Common Stock       $ 621,000          
ATM [Member]                  
Equity Offering, Maximum Amount           $ 50,000,000 $ 30,000,000   $ 30,000,000
Stock Issued During Period, Shares, New Issues (in shares) | shares       379,772 211,474        
Proceeds from Issuance of Common Stock       $ 1,876,000 $ 2,735,000        
Equity Offering, Remaining Availability   $ 48,050,000   48,050,000          
ELOC [Member]                  
Equity Offering, Maximum Amount               $ 10,000,000  
Stock Issued During Period, Shares, New Issues (in shares) | shares         12,000        
Proceeds from Issuance of Common Stock       $ 0 $ 69,000        
ELOC [Member] | Lincoln [Member]                  
Equity Committed, Issuable, Maximum Value               $ 10,000,000  
Reverse Stock Split [Member]                  
Stockholders' Equity Note, Stock Split, Conversion Ratio 10