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Note 2 - Significant Accounting Policies (Details Textual)
$ in Thousands
 1 Months Ended 12 Months Ended 85 Months Ended
Jul. 26, 2022
shares
Jun. 30, 2022
USD ($)
Jan. 31, 2023
USD ($)
Jan. 31, 2022
USD ($)
Jan. 31, 2023
USD ($)
Dec. 31, 2015
USD ($)
Foreign Currency Transaction Gain (Loss), Realized     $ 300 $ 100    
Cash and Cash Equivalents, at Carrying Value, Total     5,773 8,214 $ 5,773  
Broker-Dealer, Draft Payable     200 200 200  
Restricted Cash and Cash Equivalents, Total     1,020 1,557 1,020  
Accounts Receivable, Outstanding for Several Years     2,700   2,700 $ 41,900
Retention Receivable, Settlement Amount   $ 900     39,100  
Retention Receivable     2,500   2,500  
Depreciation, Total     3,700 4,100    
Impairment, Long-Lived Asset, Held-for-Use, Total     0      
Goodwill, Impairment Loss     0      
Finite-Lived Patents, Gross     2,700 2,700 2,700  
Finite-Lived Intangible Assets, Accumulated Amortization     $ 2,600 2,600 2,600  
Finite-Lived Intangible Asset, Expected Amortization, Year One       100    
Finite-Lived Intangible Asset, Expected Amortization, Year Two       100    
Finite-Lived Intangible Asset, Expected Amortization, Year Four       100    
Finite-Lived Intangible Asset, Expected Amortization, Year Three       100    
Finite-Lived Intangible Asset, Expected Amortization, Year Five       100    
Finite-Lived Intangible Asset, Useful Life (Year)     8 years      
Research and Development Expense, Total     $ 700 $ 400    
Treasury Stock, Shares, Retired (in shares) | shares 239,168          
Minimum [Member]            
Property, Plant and Equipment, Useful Life (Year)     3 years      
Maximum [Member]            
Property, Plant and Equipment, Useful Life (Year)     30 years      
Accounts Receivable [Member]            
Accounts Receivable, Allowance for Credit Loss, Ending Balance     $ 0   0  
Accounts Receivable [Member] | Customer Concentration Risk [Member]            
Number of Major Customers     0 1    
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member]            
Concentration Risk, Percentage       11.90%    
Revenue Benchmark [Member] | Customer Concentration Risk [Member]            
Number of Major Customers     0 0    
Geographic Distribution, Domestic [Member]            
Cash and Cash Equivalents, at Carrying Value, Total     $ 100 $ 100 100  
Restricted Cash and Cash Equivalents, Total     0 0 0  
Geographic Distribution, Foreign [Member]            
Cash and Cash Equivalents, at Carrying Value, Total     5,700 8,200 5,700  
Restricted Cash and Cash Equivalents, Total     $ 1,000 $ 1,600 $ 1,000