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Note 2 - Summary of Significant Accounting Policies (Details Textual)
 1 Months Ended 12 Months Ended
Mar. 07, 2025
USD ($)
$ / shares
shares
Nov. 05, 2024
USD ($)
$ / shares
shares
Feb. 02, 2023
USD ($)
$ / shares
Jan. 30, 2023
USD ($)
$ / shares
shares
Feb. 28, 2023
USD ($)
Nov. 30, 2022
USD ($)
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
Dec. 31, 2020
USD ($)
shares
Mar. 06, 2024
USD ($)
$ / shares
Jul. 02, 2021
USD ($)
May 31, 1988
USD ($)
Net Income (Loss) Attributable to Parent             $ (31,140,000) $ (31,446,000)          
Working Capital             11,400,000            
Net Cash Provided by (Used in) Operating Activities             (21,532,000) (20,924,000)          
Gain (Loss) on Extinguishment of Debt             0 (5,331,000)          
Proceeds from Issuance of Common Stock             $ 22,135,000 38,490,000          
Number of Operating Segments             2            
Revenues             $ 9,608,000 $ 1,991,000          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares                   0      
Weighted Average Number of Shares Outstanding, Diluted, Adjustment (in shares) | shares             9,861,000 5,290,000          
Goodwill, Ending Balance             $ 5,714,000 $ 5,714,000         $ 7,006,000
Goodwill Amortized Portion                   $ 3,193,000      
Goodwill, Impairment Loss                 $ 0        
Impairment of Intangible Assets, Finite-Lived               0          
Debt Discount, Addition             4,700,000 700,000          
Interest Paid, Excluding Capitalized Interest, Operating Activities             1,500,000            
Dividends Payable, Current             $ 1,288,000 1,288,000          
Purchase Agreement, Miles of Pipeline             180            
Purchase Options, Land             $ 5,000,000 0          
Income Taxes Paid             11,000 11,000          
ATEC Acquisition [Member]                          
Goodwill, Acquired During Period           $ 1,900,000              
General and Administrative Expense [Member]                          
Share-Based Payment Arrangement, Expense             4,600,000 1,500,000          
Intersegment Eliminations [Member]                          
Revenues             0 (311,000)          
Gross Profit               $ 99,000          
Maximum [Member] | Land, Buildings and Improvements [Member]                          
Property, Plant and Equipment, Useful Life (Year)               45 years          
Maximum [Member] | Machinery and Equipment [Member]                          
Property, Plant and Equipment, Useful Life (Year)               15 years          
Minimum [Member] | Land, Buildings and Improvements [Member]                          
Property, Plant and Equipment, Useful Life (Year)               5 years          
Minimum [Member] | Machinery and Equipment [Member]                          
Property, Plant and Equipment, Useful Life (Year)               5 years          
New Loan [Member]                          
Repayments of Debt     $ 15,000,000 $ 15,000,000                  
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares     $ 4.8                    
Debt Instrument, Face Amount                       $ 50,000,000  
First Amended Credit Agreement 1 [Member]                          
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares     $ 4.8                    
First Amended Credit Agreement 1 [Member] | Maximum [Member]                          
Debt Conversion, Original Debt, Amount     $ 15,000,000                    
Senior Secured Convertible Terms Loans [Member]                          
Debt Instrument, Face Amount                     $ 20,000,000    
Secured Non Convertible Terms Loans [Member]                          
Debt Instrument, Face Amount               $ 20,000,000     $ 21,200,000    
Convertible Loans [Member]                          
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares   $ 5.14                 $ 5.3    
Debt Instrument, Face Amount                     $ 16,000,000    
Certain Institutional and Individual Investors [Member]                          
Proceeds from Issuance of Common Stock             $ 22,100,000 $ 38,500,000          
Stock Issued During Period, Shares, New Issues (in shares) | shares             7,000,000 10,500,000          
Private Placement [Member] | Direct Offering [Member]                          
Proceeds from Issuance of Common Stock         $ 15,000,000                
November 2024 Direct Offering [Member] | Certain Institutional and Individual Investors [Member]                          
Stock Issued During Period, Shares, New Issues (in shares) | shares   7,000,000   10,500,000                  
Shares Issued, Price Per Share (in dollars per share) | $ / shares   $ 3.34                      
Proceeds from Issuance of Common Stock, Gross   $ 23,400,000                      
Proceeds from Issuance of Common Stock, Net   $ 22,100,000                      
Direct Offering [Member]                          
Shares Issued, Price Per Share (in dollars per share) | $ / shares       $ 3.84                  
Proceeds from Issuance of Common Stock, Gross       $ 40,320,000                  
Proceeds from Issuance of Common Stock, Net       $ 38,500,000                  
March 2025 Direct Offering [Member] | Certain Institutional and Individual Investors [Member] | Subsequent Event [Member]                          
Stock Issued During Period, Shares, New Issues (in shares) | shares 5,715,000                        
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 3.5                        
Proceeds from Issuance of Common Stock, Gross $ 20,000,000                        
Proceeds from Issuance of Common Stock, Net $ 18,300,000