Note 7 - Financing Arrangements and Fair Value of Financial Instruments (Detail) (USD $)	3 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Line of Credit Facility, Maximum Borrowing Capacity	$ 125,000,000
Line of Credit Facility, Amount Outstanding	66,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.00%
Debt Conversion Converted Instrument Shares Issued For Basis Principal (in Shares)	90.8893
Debt Conversion Principal Amount Of Senior Notes As Basis For Conversion Rate	1,000
Debt Instrument, Convertible, Conversion Price (in Dollars per share)	$ 11.00
Fair Value, Estimate Not Practicable, Senior Debt Obligations	158,600,000	195,800,000
Senior Notes Due October First Two Thousand And Seventeen [Member]
Debt Instrument, Face Amount	$ 172,500,000