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Note 3 - Investments (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Available-for-sale Securities, Current, Total | $ 335,000 | $ 258,000 | [1]
Debt Securities, Available-for-sale, Realized Gain (Loss), Total | 231,000 | (50,000) |
Debt Securities, Available-for-sale, Realized Loss | 170,000 | 57,000 |
Debt Securities, Available-for-sale, Realized Gain | $ 61,000 | 7,000 |
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax |  | 57,000 |
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax |  | $ 7,000 |
[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.

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