Note 9 - Long-Term Debt (Details) (Line of Credit [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	Apr. 10, 2013
Credit Facility 2013 [Member] | Minimum [Member]
Note 9 - Long-Term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 150.0
Credit Facility 2013 [Member] | Maximum [Member]
Note 9 - Long-Term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	200.0
Working Capital Sublimit [Member] | Minimum [Member]
Note 9 - Long-Term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	25.0
Working Capital Sublimit [Member] | Maximum [Member]
Note 9 - Long-Term Debt (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 75.0
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Note 9 - Long-Term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Note 9 - Long-Term Debt (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%