Note 13 - Components of Net Periodic Benefit Cost (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Pension Plan [Member]
Service cost	$ 17,000	$ 15,000	$ 51,000	$ 46,000
Interest cost	15,000	15,000	46,000	46,000
Expected return on assets	(17,000)	(16,000)	(51,000)	(49,000)
Amortization of net actuarial loss and prior service cost	2,000	2,000	5,000	5,000
Net periodic pension cost	17,000	16,000	51,000	48,000
Service cost	5,000	4,000	15,000	13,000
Interest cost	3,000	4,000	9,000	12,000
Amortization of net actuarial loss and prior service cost	(2,000)	(2,000)	(5,000)	(5,000)
Net periodic pension cost	$ 8,000	$ 8,000	$ 24,000	$ 25,000