Note 9 - Pension and Other Postretirement Benefit Plans (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Employee Pension Plan [Member]
Note 9 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year		$ 800,000
Defined Benefit Plan, Contributions by Employer	500,000
Outside Director Pension Plan [Member]
Note 9 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year		200,000
Defined Benefit Plan, Contributions by Employer	49,000
Other Postretirement Benefit Plans [Member]
Note 9 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 29,000