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Note 7 - Commitments and Contingencies (Details Textual)
$ / shares in Units, $ in Thousands
 12 Months Ended
Apr. 30, 2023
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
$ / shares
Nov. 08, 2024
USD ($)
ft²
Sep. 20, 2022
USD ($)
May 31, 2019
ft²
Jul. 31, 2017
ft²
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares   $ 0.001 $ 0.001        
Operating Lease, Right-of-Use Asset   $ 7,163 $ 7,256        
Operating Lease, Liability   8,898 9,144        
Corporate Headquarters in Hayward, California [Member]              
Lessee, Operating Lease, Term of Contract (Year)             5 years
Area of Real Estate Property (Square Foot) | ft²             15,700
Corporate Headquarters in Hayward, California [Member] | Expansion Premises 1 [Member]              
Area of Real Estate Property (Square Foot) | ft²           13,300  
Corporate Headquarters in Hayward, California [Member] | Expansion Premises 2 [Member]              
Area of Real Estate Property (Square Foot) | ft²           21,300  
Miami Lease [Member]              
Lessee, Operating Lease, Term of Contract (Year)       65 months      
Area of Real Estate Property (Square Foot) | ft²       2,000      
Lessee, Operating Lease, Renewal Term (Year)       5 years      
Lessee, Operating Lease, Monthly Rent       $ 20      
Lessee, Operating Lease, Rent, Annual Increase Percentage       3.00%      
Lessee, Operating Lease, Discount Rate       8.00%      
Operating Lease, Right-of-Use Asset       $ 800      
Operating Lease, Expense   $ 2,500 2,300        
Operating Lease, Liability       $ 800      
Robert W. Duggan [Member] | Private Placement [Member]              
Stock Issued During Period, Shares, New Issues (in shares) | shares 10,022,937            
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.001            
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 6.51            
Two Thousand Twenty Two Loan Agreement [Member] | Robert W. Duggan [Member]              
Debt Instrument, Face Amount         $ 65,000    
Debt Instrument Quarterly Interest Rate         5    
Debt Instrument, Increase, Accrued Interest     1,700        
Interest Expense     $ 1,100        
Loan Agreement [Member]              
Debt Instrument, Decrease, Forgiveness $ 65,000            
Interest Payable $ 200