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Note 2 - Income (Loss) Per Share (Details Textual) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares) 133,000 261,000 216,000 194,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 0 0 0 0