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Note 10 - Pension and Other Postretirement Benefit Plans (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Directors' Plan [Member]    
Note 10 - Pension and Other Postretirement Benefit Plans (Details) [Line Items]    
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year   $ 300,000
Defined Benefit Plan, Contributions by Employer $ 100,000  
Other Postretirement Benefit Plan [Member]    
Note 10 - 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