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Note 3 - Shares Used in Calculation of Earnings Per Share (Details) - shares
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Weighted-average common shares outstanding (in shares) 2,437,302 2,248,516 2,350,822 2,245,868
Average treasury stock shares (in shares) (386,165) (189,530) (386,165) (189,530)
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share (in shares) 2,051,137 2,058,986 1,964,657 2,056,338
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 8,274 9,327 8,522 9,590
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share (in shares) 2,059,411 2,068,313 1,973,179 2,065,928