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Note B - Recent Accounting Pronouncements (Details Textual) - Accounting Standards Update 2016-01 [Member]
$ in Millions
Jan. 01, 2018
USD ($)
AOCI Attributable to Parent [Member]  
Reclassification of Gain (Loss) Unrealized on Equity Securities from AOCI to Retained Earnings $ (7.4)
Retained Earnings [Member]  
Reclassification of Gain (Loss) Unrealized on Equity Securities from AOCI to Retained Earnings $ 7.4