Note 14 - Benefit Plans - Weighted-average Assumptions Used to Determine Benefit Obligations (Details)		Dec. 31, 2016	Dec. 31, 2015
Rate of compensation increase (1)	[1]
Pension Plan [Member]
Discount rate - pension plan		4.14%	4.36%
Other Pension Plan [Member]
Discount rate - pension plan		4.16%	4.39%

[1] No compensation increase was assumed as the plans were frozen effective December 31, 2008.