Note 7 - Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	15 Months Ended			61 Months Ended
	Dec. 31, 2011	Oct. 22, 2015	Jun. 30, 2011	Oct. 22, 2015 Initial Interest Rate [Member]	Oct. 22, 2015 Minimum [Member] Prime [Member]	Oct. 22, 2015 Minimum [Member] LIBOR [Member]	Oct. 22, 2015 Maximum [Member] Prime [Member]	Oct. 22, 2015 Maximum [Member] LIBOR [Member]
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)		$ 300,000
Line of Credit Facility, Interest Rate Description				1.75%	0.75%	1.75%	1.75%	2.75%
Line of Credit Facility, Amount Outstanding (in Dollars)	70,139		96,921
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars)	$ 225,810
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.375%