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Note 3 - Earnings Per Share - Shares Used in Calculation of Earnings Per Share (Details) - shares
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Weighted-average common shares issued (in shares)                 3,616,119 3,415,115
Average treasury stock shares (in shares)                 (386,165) (386,165)
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share (in shares) 3,239,180 3,234,393 3,225,726 3,220,262 3,215,300 3,212,335 3,000,451 2,679,816 3,229,954 3,028,950
Additional common stock equivalents (stock options and restricted stock) used to calculate diluted earnings per share (in shares)                 13,953 23,635
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share (in shares) 3,250,149 3,248,326 3,240,329 3,238,069 3,231,791 3,223,753 3,014,140 2,692,015 3,243,907 3,052,585