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Note 14 - Related Party Transactions (Details Textual) - USD ($)
3 Months Ended
Sep. 08, 2021
Mar. 12, 2021
Mar. 31, 2022
Mar. 31, 2021
Nov. 30, 2020
Gain (Loss) on Extinguishment of Debt, Total     $ (0) $ (250,000)  
Interest Expense, Debt, Total     0 459,000  
Non-exclusive Agreement with Echo Echo, LLC [Member]          
Related Party Transaction, Amounts of Transaction $ 29,000        
Direct Operating Costs, Per Flight Hour $ 675,000        
Employee Service [Member] | Employees of Company Affiliated With the Founder and CEO [Member]          
Related Party Transaction, Amounts of Transaction     31,000 0  
Employee Service [Member] | Company That Employed The Chief Financial Officer [Member]          
Related Party Transaction, Amounts of Transaction     $ 20,000 31,000  
Series A Preferred Stock [Member] | SH Investment Fund I LLC [Member]          
Stock Issued During Period, Units, Issued for Note Payable (in shares)   1,250      
Stock Issued During Period, Value, Issued for Note Payable   $ 1,250,000      
Loans Payable [Member]          
Debt Instrument, Redemption Amount   5,100,000      
Gain (Loss) on Extinguishment of Debt, Total   5,600,000      
Payment for Debt Extinguishment or Debt Prepayment Cost   150,000      
Interest Expense, Debt, Total       $ 120,000  
SH Investment Fund I LLC [Member]          
Gain (Loss) on Extinguishment of Debt, Total   (250,000)      
Notes Payable, Total   $ 1,000,000.0      
Promissory Note [Member] | BOC Yellowstone LLC [Member]          
Debt Instrument, Interest Rate, Stated Percentage   5.50%      
Promissory Note [Member] | SH Investment Fund I LLC [Member]          
Debt Instrument, Interest Rate, Stated Percentage         8.00%
Line of Credit Facility, Maximum Borrowing Capacity         $ 1,000,000