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Note 7 - Intangible Assets - Estimated Net Amortization of Identifiable Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
2022, intangible asset $ 1,184  
2023, intangible asset 1,184  
2024, intangible asset 1,187  
2025, intangible asset 1,184  
2026, intangible asset 1,170  
Thereafter, intangible asset 3,029  
Total, intangible asset 8,938 $ 114
Patents [Member]    
2022, intangible asset 599  
2023, intangible asset 599  
2024, intangible asset 600  
2025, intangible asset 599  
2026, intangible asset 585  
Thereafter, intangible asset 1,225  
Total, intangible asset 4,207 $ 114
Defensive Assets [Member]    
2022, intangible asset 585  
2023, intangible asset 585  
2024, intangible asset 587  
2025, intangible asset 585  
2026, intangible asset 585  
Thereafter, intangible asset 1,804  
Total, intangible asset $ 4,731