Note 8 - Employee Benefit Plans (Detail) - Expected Benefit Payments (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Defined Benefit Retirment Plan [Member]
2013	$ 158
2014	178
2015	225
2016	163
2017	210
2018-2022	989
Total	1,923
Post Retirment Benefit Plan [Member] | Medicare Part D Subsidy Receipts [Member]
2013	30
2014	29
2015	28
2016	27
2017	25
2018-2022	98
Total	237
Post Retirment Benefit Plan [Member]
2013	604
2014	506
2015	474
2016	460
2017	439
2018-2022	2,237
Total	$ 4,720