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Note 1 - Nature of Business, Financial Condition and Basis of Presentation - Estimated Net Amortization of Identifiable Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
2021 (remaining) $ 291  
2022 1,176  
2023 1,176  
2024 1,176  
2025 1,176  
2026 and thereafter 4,103  
Total 9,098 $ 114
Patents [Member]    
2021 (remaining) 147  
2022 601  
2023 601  
2024 601  
2025 601  
2026 and thereafter 1,743  
Total 4,294 $ 114
Defensive Assets [Member]    
2021 (remaining) 144  
2022 575  
2023 575  
2024 575  
2025 575  
2026 and thereafter 2,360  
Total $ 4,804