Note 12 - Pension and Other Postretirement Benefit Plans (Detail) - The following benefit payments, which reflect expected future service, are expected to be paid by the Retirement Plan: (Retirement Plan [Member], USD $)	Dec. 31, 2012
Retirement Plan [Member]
2013	$ 1,022,000
2014	1,042,000
2015	1,100,000
2016	1,136,000
2017	1,151,000
2018 – 2022	$ 5,931,000

Note 12 - Pension and Other Postretirement Benefit Plans (Detail) - The following benefit payments, which reflect expected future service, are expected to be paid by the Retirement Plan: (Retirement Plan [Member], USD $)

Dec. 31, 2012

Retirement Plan [Member]

$ 1,022,000

1,042,000

1,100,000

1,136,000

1,151,000

$ 5,931,000