Note 8 - Net Periodic Benefit Cost (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Recognized Actuarial Loss [Member]
Recognized actuarial loss	$ 772,000	$ 322,000
Service cost - benefits earned during the period	48,000	81,000
Interest cost on projected benefit obligation	951,000	1,001,000
Expected return on plan assets	(1,343,000)	(1,395,000)
Recognized actuarial loss	327,000	4,168,000
Settlement loss	460,000	208,000
Net periodic pension cost after settlements	$ 888,000	$ 217,000