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Note 8 - Employee Benefit Plans (Details) - Defined Benefit Plan Activity - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Change in plan assets      
Fair value of plan assets at beginning of year $ 17,130    
Fair value of plan assets at end of year 16,131 $ 17,130  
Other changes in plan assets and benefit obligations recognized in other comprehensive loss      
Net (gain) loss 1,108 1,066 $ (1,898)
Amortization of prior service cost 72 71 66
Pension Plan [Member]      
Change in benefit obligation      
Projected benefit obligation at beginning of year 19,324 17,185 18,054
Service cost 620 524 596
Interest cost 669 663 617
Actuarial (gain) loss 798 1,674 (1,149)
Benefits paid (984) (722) (933)
Projected benefit obligation at end of year 20,427 19,324 17,185
Change in plan assets      
Fair value of plan assets at beginning of year 17,130 16,605 14,325
Actual return on plan assets (155) 884 2,225
Employer contribution 140 363 988
Benefits paid (984) (722) (933)
Fair value of plan assets at end of year 16,131 17,130 16,605
Funded status at the end of the year (4,296) (2,194) (580)
Amounts recognized in the Consolidated Balance Sheet      
Deferred tax asset 1,504 768 203
Other liabilities (4,296) (2,194) (580)
Total amounts recognized in the Consolidated Balance Sheet (2,792) (1,426) (377)
Amounts recognized in accumulated other comprehensive (loss), net      
Net loss (8,627) (6,922) (5,282)
Prior service cost 559 669 779
Deferred tax asset 2,798 2,163 1,550
Amount recognized (5,270) (4,090) (2,953)
Accrued/Prepaid benefit cost, net      
Benefit obligation (20,427) (19,324) (17,185)
Fair value of assets 16,131 17,130 16,605
Unrecognized net actuarial loss 8,627 6,922 5,282
Unrecognized prior service cost (559) (669) (779)
Deferred tax liability (1,294) (1,395) (1,347)
Prepaid benefit cost included in other liabilities 2,478 2,664 2,576
Components of net periodic benefit cost      
Service cost 620 524 596
Interest cost 669 663 617
Expected return on plan assets (1,166) (1,112) (984)
Amortization of prior service cost (110) (110) (101)
Recognized net actuarial loss 414 262 532
Net periodic benefit cost 427 227 660
Other changes in plan assets and benefit obligations recognized in other comprehensive loss      
Net (gain) loss 1,705 1,640 (2,921)
Amortization of prior service cost 110 110 101
Deferred income tax expense (benefit) (635) (612) 987
Total recognized 1,180 1,138 (1,833)
Total recognized in net periodic benefit cost and other comprehensive loss $ 2,242 $ 1,977 $ (2,160)
Weighted average assumptions at end of the year      
Discount rate used for net periodic pension cost 3.75% 4.50% 3.75%
Discount rate used for disclosure 4.00% 3.75% 4.50%
Expected return on plan assets 7.50% 7.50% 7.50%
Rate of compensation increase 3.00% 3.00% 3.00%