Note 9 - Financial Instruments and Fair Value (Detail) - Derivative Financial Instruments (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Interest Rate Swap Agreement 1 [Member]	Dec. 31, 2012 Interest Rate Swap Agreement 2 [Member]	Dec. 31, 2012 Interest Rate Swap Agreement 3 [Member]	Dec. 31, 2012 Interest Rate Swap Agreement 4 [Member]	Dec. 31, 2012 Interest Rate Swap Agreement 5 [Member]	Dec. 31, 2012 Interest Rate Swap Agreement 6 [Member]	Dec. 31, 2012 Interest Rate Swap Agreement 7 [Member]	Dec. 31, 2012 Interest Rate Swap Agreement 8 [Member]	Dec. 31, 2012 Interest Rate Swap Agreement 9 [Member]	Dec. 31, 2012 Interest Rate Swap Agreement 10 [Member]	Dec. 31, 2012 Interest Rate Swap Agreement 11 [Member]	Dec. 31, 2012 Interest Rate Swap Agreement 12 [Member]
Current Notional Amount	$ 41,700	$ 41,700	$ 2,033	$ 4,200	$ 7,294	$ 1,410	$ 2,509	$ 5,678	$ 5,200	$ 800	$ 1,533	$ 7,733	$ 667	$ 2,680
Fixed Interest Rate			5.075%	5.075%	5.39%	5.39%	5.39%	5.39%	5.38%	5.29%	5.29%	5.29%	5.29%	5.29%
Underlying Rate			3 month LIBOR	3 month LIBOR	1 month LIBOR	1 month LIBOR	1 month LIBOR	1 month LIBOR	1 month LIBOR	1 month LIBOR	1 month LIBOR	1 month LIBOR	1 month LIBOR	1 month LIBOR
Expiration Date			Jul. 01, 2015	Jul. 01, 2015	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Jun. 29, 2015	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2015
Fair Value			$ (99)	$ (205)	$ (288)	$ (56)	$ (99)	$ (224)	$ (272)	$ (40)	$ (77)	$ (388)	$ (33)	$ (134)