Note 4 - Common Stock (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

Schedule of Common Stock Outstanding Roll Forward [Table Text Block]

			Shares of
	Shares		Treasury		Shares
	Issued		Stock		Outstanding
January 1, 2015, $.50 par value stock, 200,000 shares authorized		184,735		26,063		158,672
Purchase of stock		---		214		(214	)
December 31, 2015, $.50 par value stock, 200,000 shares authorized		184,735		26,277		158,458
Purchase of stock		---		554		(554	)
December 31, 2016, $.50 par value stock, 200,000 shares authorized		184,735		26,831		157,904