Note 8 - Employee Benefit Plans (Details) - Benefit Obligation and Prepaid Benefit Costs Assumptions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Note 8 - Employee Benefit Plans (Details) - Benefit Obligation and Prepaid Benefit Costs Assumptions [Line Items]
Discount rate: net periodic pension cost		4.17%	4.81%
Discount rate: projected benefit obligation		4.45%	4.17%
Expected rate of return on plan assets		7.20%	7.20%
Rate of compensation increase: net periodic pension cost		2.00%	4.00%
Rate of compensation increase: projected benefit obligation			2.00%
Assumed for 2016 Through 2018 [Member]
Note 8 - Employee Benefit Plans (Details) - Benefit Obligation and Prepaid Benefit Costs Assumptions [Line Items]
Rate of compensation increase: projected benefit obligation	[1]	0.00%
Assumed for after 2018 [Member]
Note 8 - Employee Benefit Plans (Details) - Benefit Obligation and Prepaid Benefit Costs Assumptions [Line Items]
Rate of compensation increase: projected benefit obligation	[1]	2.00%

[1] 0% is assumed for years 2016 through 2018 and 2% is assumed thereafter.