Note 11 - Retirement Plans (Tables) - Supplemental Employee Retirement Plan [Member]

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Changes in Projected Benefit Obligations [Table Text Block]

(In thousands)	201 7			201 6
Change in Benefit Obligation
Obligation at beginning of year	$	718		$	600
Service cost		22			19
Interest cost		23			24
Actuarial (gain) loss		(180	)		111
Benefit payments		(36	)		(36	)
Obligation at end of year	$	547		$	718

Schedule of Net Benefit Costs [Table Text Block]

(In thousands)	201 7			201 6
Service cost	$	22		$	19
Interest cost		23			24
Recognized net actuarial loss		5			5
Net periodic benefit cost	$	50		$	48
Major assumptions:
Discount rate used to determine net period benefit cost		3.31	%		3.39	%
Discount rate used to determine benefit obligation at year end		2.86			3.31
Rate of compensation increase		4.00			4.00

Schedule of Expected Benefit Payments [Table Text Block]

(In thousands)	Supplemental Retirement Plan
201 8	$	58
201 9		60
20 20		60
20 21		60
20 22		56
2023-2027		219
Total	$	513

Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

(In thousands)	201 7			201 6
Unrecognized net actuarial (gain) loss	$	(98	)	$	87
Total	$	(98	)	$	87

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

(In thousands)	Supplemental Retirement Plan
Unrecognized net actuarial gain	$	(5	)
Total	$	(5	)