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Note 19 - Series B Junior Participating Preferred Stock	12 Months Ended
Dec. 31, 2014
Stockholder Rights Plan Disclosure [Abstract]
Stockholder Rights Plan Disclosure [Text Block]	Note 19 - Series B Junior Participating Preferred Stock On August 2, 2007, the NHC Board of Directors approved the adoption of a stockholder rights plan and declared a dividend distribution of one right (a "Right") for each outstanding share of NHC common stock to stockholders of record at the close of business on August 2, 2007. Each Right entitles the registered holder to purchase from NHC a unit consisting of one one-ten thousandth of a share of Series B Junior Participating Preferred Stock, $0.01 par value at a purchase price of $250 per Unit, subject to adjustment. The description and terms of the Rights are set forth in a rights agreement between NHC and Computershare Trust Company, N.A., as rights agent, dated as of August 2, 2007, as may be amended, restated or otherwise modified from time to time. No shares have been issued pursuant to this stockholder rights plan.

Note 19 - Series B Junior Participating Preferred Stock

12 Months Ended

Dec. 31, 2014

Stockholder Rights Plan Disclosure [Abstract]

Stockholder Rights Plan Disclosure [Text Block]

Note 19 - Series B Junior Participating Preferred Stock

On August 2, 2007, the NHC Board of Directors approved the adoption of a stockholder rights plan and declared a dividend distribution of one right (a "Right") for each outstanding share of NHC common stock to stockholders of record at the close of business on August 2, 2007. Each Right entitles the registered holder to purchase from NHC a unit consisting of one one-ten thousandth of a share of Series B Junior Participating Preferred Stock, $0.01 par value at a purchase price of $250 per Unit, subject to adjustment. The description and terms of the Rights are set forth in a rights agreement between NHC and Computershare Trust Company, N.A., as rights agent, dated as of August 2, 2007, as may be amended, restated or otherwise modified from time to time. No shares have been issued pursuant to this stockholder rights plan.