Note 16 - Employee Benefit Plans - Summaries of Changes in Benefit Obligations and Plan Assets and of Funded Status of Pension Plans (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Benefit obligation at beginning of year	$ 40,958	$ 45,438
Service cost	6	14
Interest cost on projected benefit obligation	1,675	1,691
Actuarial (gain) loss	(325)	(3,115)
Benefits paid	(3,002)	(3,070)
Benefit obligation at end of year	39,312	40,958
Fair value of plan assets at beginning of year	35,126	38,038
Actual return on plan assets	1,714	(157)
Company contributions	0	315
Fair value of plan assets at end of year	33,838	35,126
Underfunded status of the plans			$ (5,474)	$ (5,832)
Other assets			0	0
Other liabilities			(5,474)	(5,832)
Net amount recognized			(5,474)	(5,832)
Projected benefit obligation			39,312	40,958
Accumulated benefit obligation			39,309	40,953
Fair value of plan assets	$ 35,126	$ 35,126	$ 33,838	$ 35,126
Discount rate			4.05%	4.35%
Rate of compensation increase			4.00%	4.00%
Weighted Average Asset Allocations			100.00%	100.00%
Equity Securities [Member]
Weighted Average Asset Allocations			27.00%	30.00%
Debt Securities [Member]
Weighted Average Asset Allocations			73.00%	70.00%
Minimum [Member]
Expected long-term rate of return on plan assets	5.40%	5.70%
Maximum [Member]
Expected long-term rate of return on plan assets	6.75%	6.75%

The amount of other assets in the defined benefit plan.

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- Definition

The amount of other liabilities in defined benefit plan.

+ References

No definition available.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)
-URI http://asc.fasb.org/extlink&oid=6504192

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

+ References

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- Definition

The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

+ References

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The interest rate used to adjust for the time value of money for the plan.

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ References

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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Amount of contributions made by the employer to defined benefit plans.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

+ References

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References

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If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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