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Note 5 - Commitments and Contingencies (Details Textual)
12 Months Ended
Dec. 31, 2023
USD ($)
a
Jan. 31, 2024
EUR (€)
Purchase Obligation $ 932,000  
VTT Technical Research Centre of Finland Ltd [Member] | Subsequent Event [Member]    
Collaborative Arrangement, Payment for Additional Development and Commercialization | €   € 186,000
Jupiter Florida Headqauarters Lease [Member]    
Area of Real Estate Property (Square Foot) | a 1,719  
Operating Leases, Monthly Rental Rate $ 59,000  
Netherlands Office Lease [Member]    
Operating Leases, Annual Rental Rate $ 4,800