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Note 4 - Investments in Debt Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Interest and Other Income, Total $ 61 $ 125 $ 297 $ 344
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total     0  
Debt Securities [Member]        
Interest and Other Income, Total $ 61 $ 0 $ 187 $ 0