Note 20 - Quarterly Results of Operations (Unaudited) (Detail) - Quarterly Financial Information (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Operating revenues	$ 134,771	$ 124,416	$ 129,569	$ 123,673	$ 126,202	$ 130,137	$ 139,027	$ 124,042	$ 512,428	$ 519,408
Operating expenses and costs	138,552	132,941	133,898	130,309	132,021	135,996	136,815	127,224	535,700	532,057
Operating (loss) income	(3,781)	(8,525)	(4,329)	(6,636)	(5,819)	(5,859)	2,212	(3,182)	(23,272)	(12,649)
Other expenses, net	1,100	1,002	975	911	863	703	795	732	3,988	3,093
(Loss) income before income taxes	(4,881)	(9,527)	(5,304)	(7,547)	(6,682)	(6,562)	1,417	(3,914)	(27,260)	(15,742)
Income tax (benefit) expense	(1,641)	(3,455)	(1,818)	(2,674)	(2,328)	(2,257)	819	(1,198)	(9,589)	(4,965)
Net (loss) income	$ (3,240)	$ (6,072)	$ (3,486)	$ (4,873)	$ (4,354)	$ (4,305)	$ 598	$ (2,716)	$ (17,671)	$ (10,777)
Average shares outstanding (Basic) (in Shares)	10,313	10,312	10,304	10,300	10,297	10,294	10,306	10,298	10,310	10,302
Basic (loss) earnings per share (in Dollars per share)	$ (0.31)	$ (0.59)	$ (0.34)	$ (0.47)	$ (0.42)	$ (0.42)	$ 0.06	$ (0.26)	$ (1.71)	$ (1.05)
Average shares outstanding (Diluted) (in Shares)	10,313	10,312	10,304	10,300	10,297	10,294	10,317	10,298	10,310	10,302
Diluted (loss) earnings per share (in Dollars per share)	$ (0.31)	$ (0.59)	$ (0.34)	$ (0.47)	$ (0.42)	$ (0.42)	$ 0.06	$ (0.26)	$ (1.71)	$ (1.05)