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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Mar. 31, 2018	Dec. 31, 2017	[1]
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, authorized (in shares)	50,000,000	50,000,000
Common stock, issued (in shares)	21,381,779	21,381,779
Treasury stock (in shares)	4,534,327	4,383,553
Undesignated Par Value [Member]
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, authorized (in shares)	1,000,000	1,000,000
Designated Par Value [Member]
Preferred stock, authorized (in shares)	25,000	25,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, outstanding (in shares)	0	0
[1] Derived from audited financial statements

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Face amount or stated value per share of common stock.

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Face amount per share of no-par value preferred stock nonredeemable or redeemable solely at the option of the issuer.

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