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Note 6 - Goodwill and Intangible Assets - Estimated Future Amortization Expense Related to Definite-lived Intangible Assets (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
[1]
2020 $ 4,000  
2021 3,000  
2022 2,000  
2023 1,000  
Thereafter 1,000  
Total $ 11,000 $ 16,000
[1] The condensed consolidated balance sheet as of December 31, 2018 has been prepared using information from the audited consolidated balance sheet as of that date.