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Note 3 - Related-party Transactions (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended 24 Months Ended
Apr. 01, 2024
Jan. 01, 2024
May 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Apr. 30, 2027
May 31, 2021
Management Fee Expense       $ 172 $ 144      
Operating Lease, Expense       300 100      
Lazarus Energy Holdings (LEH) [Member]                
Sublease Income       10 10      
Management Fee Expense       200 100      
Lazarus Energy Holdings (LEH) [Member] | Office Lease of Corporate Headquarters in Houston, Texas [Member]                
Agreement Term (Year)           12 months    
Sublease, Monthly Rent           $ 3    
Sublease Income       10 10      
Third Amended and Restated Operating Agreement [Member]                
Agreement Term (Year)   1 year            
Related Party Transaction, Written Notice Period (Year)   90 years            
Management Fee Percentage   5.00%            
Nonrelated Party [Member]                
Debt Instrument, Face Amount [1]       2,000        
Debt Instrument, Periodic Payment [1]       10        
Accounts Receivable, after Allowance for Credit Loss, Current       104   116    
Nonrelated Party [Member] | LEH Forbearance Agreement [Member]                
Debt Instrument, Periodic Payment     $ 50     50    
Repayments of Notes Payable       100 $ 0      
Nonrelated Party [Member] | LEH Forbearance Agreement [Member] | Forecast [Member]                
Debt Instrument, Periodic Payment             $ 400  
Related Party [Member]                
Accounts Receivable, after Allowance for Credit Loss, Current       11,722   4,184    
Accounts Payable       0   $ 900    
BDEC Guaranty Fee Agreement [Member] | Jonathan Carroll [Member]                
Cash Fee, Percentage of Outstanding Principal Balance           2.00%    
Jet Fuel Sales Agreement [Member] | Lazarus Energy Holdings (LEH) [Member] | Subsequent Event [Member]                
Agreement Term (Year) 1 year              
LE Amended and Restated Guaranty Fee Agreement [Member] | Jonathan Carroll [Member]                
Cash Fee, Percentage of Outstanding Principal Balance           2.00%    
Master Services Agreement [Member] | Ingleside Crude, LLC [Member]                
Monthly Tank Rental Fee           $ 100    
LRM Amended and Restated Guaranty Fee Agreement [Member] | Jonathan Carroll [Member]                
Cash Fee, Percentage of Outstanding Principal Balance           2.00%    
NPS Guaranty Fee Agreement [Member] | Jonathan Carroll [Member]                
Cash Fee, Percentage of Outstanding Principal Balance           2.00%    
Terminal Services Agreement [Member] | Lazarus Energy Holdings (LEH) [Member]                
Agreement, Renewal Period (Year)           1 year    
Monthly Tank Rental Fee           $ 200    
BDEC Term Loan Due 2051 [Member] | Small Business Administration SBA [Member]                
Debt Instrument, Face Amount           2,000    
BDEC Term Loan Due 2051 [Member] | Small Business Administration SBA [Member] | Nonrelated Party [Member]                
Debt Instrument, Face Amount               $ 500
Affiliate Revolving Credit Agreement [Member] | LEH and Affiliates [Member] | Subsequent Event [Member]                
Debt Instrument, Face Amount $ 5,000              
Agreement, Renewal Period (Year) 1 year              
Debt Instrument, Basis Spread on Variable Rate 2.00%              
LE Term Loan Due 2034 [Member] | Veritex Community Bank [Member]                
Debt Instrument, Face Amount           25,000    
LE Term Loan Due 2034 [Member] | Veritex Community Bank [Member] | Nonrelated Party [Member]                
Debt Instrument, Face Amount [2]       25,000        
Debt Instrument, Periodic Payment [2]       300        
LRM Term Loan Due 2034 [Member] | Veritex Community Bank [Member]                
Debt Instrument, Face Amount           10,000    
LRM Term Loan Due 2034 [Member] | Veritex Community Bank [Member] | Nonrelated Party [Member]                
Debt Instrument, Face Amount [2]       10,000        
Debt Instrument, Periodic Payment [2]       100        
NPS Term Loan Due 2031 [Member] | Greater Nevada Credit Union (GNCU) [Member] | Jonathan Carroll [Member]                
Debt Instrument, Face Amount           $ 10,000    
NPS Term Loan Due 2031 [Member] | Greater Nevada Credit Union (GNCU) [Member] | Nonrelated Party [Member]                
Debt Instrument, Face Amount [3]       10,000        
Debt Instrument, Periodic Payment [3]       $ 100        
[1] Original principal amount was $0.5 million; the Blue Dolphin Term Loan Due 2051 was modified to increase the principal amount by $1.5 million. Payments deferred for thirty (30) months; first payment due and paid in November 2023; interest accrues during deferral period; loan not forgivable.
[2] Restricted cash, noncurrent totaled $1.0 and $0.0 at March 31, 2024 and December 31, 2023, respectively. Restricted cash, noncurrent reflects amounts held by Veritex in a payment reserve account, which is required to have a balance of $1.0 million. Although the amount at December 31, 2023 was $0, the payment reserve account was fully replenished on January 2, 2024.
[3] Loan requires monthly interest-only payments for the first thirty-six (36) months. Afterwards, principal and interest payments are due monthly through loan maturity. First payment due in November 2024.