Note 13 - Supplemental Retirement Benefits (Details Textual) - Supplemental Employee Retirement Plan [Member] - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Net Periodic Benefit Cost	$ 4,000	$ 4,000	$ 23,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.00%
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	$ 25,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	25,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	25,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	$ 25,000