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Note 2 - Supplemental Balance Sheet Information (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Amortization of Intangible Assets, Total $ 23,000 $ 23,000  
Goodwill and Intangible Asset Impairment, Total 0 0 $ 0
Depreciation, Depletion and Amortization, Nonproduction, Total $ 96,000 $ 58,000