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Note 5 - Commitments and Contingencies (Details Textual)
 12 Months Ended
Aug. 13, 2020
USD ($)
ft²
Jun. 30, 2020
USD ($)
ft²
Mar. 23, 2020
EUR (€)
Oct. 25, 2019
EUR (€)
Jun. 28, 2019
EUR (€)
Dec. 31, 2020
USD ($)
VTT Technical Research Centre of Finland Ltd [Member]            
Commitment Development Period (Year)         3 years  
Commitment Success Bonus Award         € 450,000  
Commitment To Pay, Expanded       € 690,000    
Commitment To Pay, Expanded, Period (Year)       1 year 6 months    
Commitment To Pay, Additional     € 700,000      
Commitments, Right To Terminate Contract Notice Period (Day)     90 days      
Jupiter Florida Headqauarters Lease [Member]            
Area of Real Estate Property (Square Foot) | ft² 2,000 4,900        
Operating Leases, Monthly Rental Rate | $ $ 4,200 $ 9,700        
Netherlands Office Lease [Member]            
Operating Leases, Annual Rental Rate | $           $ 4,000
Commitment To Pay         € 2,520,000