Note 5 - Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Foreign Earnings Repatriated		$ 200.0
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount		$ 70.0
Undistributed Earnings of Foreign Subsidiaries	$ 850.0
Incremental US Tax if Earnings were Repatriated, Percent	35.00%
Foregin Cash and Cash Equivalents, Balance Suject to Domestic Tax Upon Repatriation	$ 13.8