Note 9 - Debt (Details Textual) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2015	Jun. 30, 2015
Amended and Restated Credit Agreement [Member]
Debt Instrument, Term		5 years
Line of Credit Facility, Maximum Borrowing Capacity		$ 400.0
Line Of Credit, Accordion Feature		100.0
Line of Credit Facility, Remaining Borrowing Capacity	$ 247.2
Swing Line Loan [Member]
Line of Credit Facility, Maximum Borrowing Capacity		10.0
Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity		30.0
Standby Letters of Credit [Member]
Long-term Line of Credit	7.7
Debt Issuance Cost	$ 1.1	$ 1.3