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Note 7 - Earnings Per Share - Summary of Earnings and Weighted Average Number of Common Shares Used in Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Basic (in shares) 15,173,491 14,916,905
Net income attributable to National HealthCare Corporation $ 12,728 $ 13,699
Earnings per common share, basic (in dollars per share) $ 0.84 $ 0.92
Dilutive effect of contingent issuable stock (in shares) 194,275
Diluted (in shares) 15,212,133 15,135,446
Earnings per common share, diluted (in dollars per share) $ 0.84 $ 0.91
Employee Stock Option [Member]    
Dilutive effect share-based awards (in shares) 38,642 24,266