Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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The maximum awards to each employee under the plan per period.

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The amount of the remaining liabilities were reversed associated the modification of the plan.

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Shares matched.

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Note 10 - Equity Plans (Details Textual) - USD ($)				3 Months Ended	12 Months Ended
Note 10 - Equity Plans (Details Textual) - USD ($)	Jul. 01, 2016	May 01, 2016	Mar. 01, 2015	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Senior Management Compensation Program [Member]
ShareBased Compensation Arrangement by ShareBased Payment Award Minimum Number of Shares Per Employee					750
Sharebased Compensation Arrangement bySharebasedPaymentAwardMatchingPurchaseRequirement					500
Sharebased Compensation Arrangement by Sharebased Payment Award Award Match					250
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					137,935
Share-based Compensation Arrangement By Share-based Payment Award Equity Instruments Other Than Options Converted into Shares Intrinsic Value					$ 0	$ 0	$ 0
Restricted Stock Units (RSUs) [Member] \| Supplemental Employee Retirement Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					51,075	47,639	21,506
Restricted Stock Units (RSUs) [Member] \| Senior Management Stock Incentive Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Participant's Base Salary	10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Amount Per Employee	$ 17,500
Restricted Stock Units (RSUs) [Member] \| Senior Management Compensation Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Remaining Liability Reversed					$ 1,000,000
Restricted Stock Units (RSUs) [Member] \| Senior Management Compensation Program [Member] \| Five Year Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested					25,000
Restricted Stock Units (RSUs) [Member] \| Senior Management Compensation Program [Member] \| Ten Year Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested					50,000
Restricted Stock Units (RSUs) [Member] \| Senior Management Compensation Program [Member] \| Fifteen Year Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested					75,000
Restricted Stock Units (RSUs) [Member] \| Senior Management Compensation Program [Member] \| Twenty Five Year Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested					100,000
Restricted Stock Units (RSUs) [Member] \| Senior Management Compensation Program [Member] \| Twenty Year Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested					$ 100,000
Restricted Stock Units (RSUs) [Member] \| Non-Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		3,094	4,639
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					1 year
Restricted Stock Units (RSUs) [Member] \| Executive Vice President and Chief Operating Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				10,573
Match [Member] \| Senior Management Compensation Program [Member]
Shares Matched					2,500	9,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant					1,000,000
Share Price		$ 22.62	$ 15.09