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 |