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Note 1 - Summary of Significant Accounting Policies - Net Income (Loss) Per Common Share (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Basic weighted average common shares outstanding (in shares) 2,665,165 2,692,382
Weighted average common stock equivalents from assumed exercise of stock options (in shares) 7,232
Diluted weighted average common shares outstanding (in shares) 2,665,165 2,699,614