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Note D - Summary of Nonvested Options (Details)	3 Months Ended
	Mar. 31, 2016 $ / shares shares
Employee Stock Option [Member]
Nonvested at Beginning of Period (in shares)	28,205
Nonvested - Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 6.07
Cancelled/forfeited/expired (in shares)	(2,050)
Canceled/forfeited/expired - Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 6.07
Nonvested at End of Period (in shares)	26,155
Nonvested - Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 6.07
Restricted Stock [Member]
Nonvested at Beginning of Period (in shares)	5,700
Nonvested - Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 42.65	[1]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	7,275
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares	$ 30.81	[1]
Canceled/forfeited/expired (in shares)	(450)
Canceled/forfeited/expired - Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 42.65	[1]
Vested (in shares)	(3,525)
Vested - Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 30.80	[1]
Nonvested at End of Period (in shares)	9,000
Nonvested - Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 37.72	[1]
Cancelled/forfeited/expired (in shares)	(2,050)
[1] The weighted-average grant date fair value was based on the closing price of the Company’s stock on the date of the grant.

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were cancelled, forfeited, or expired during the reporting period.

+ References

No definition available.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee cancelled, forfeited, and expired during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a nonvested stock (or unit) option plan for which the grantee cancelled, forfeited, and expired during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

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- Definition

Number of share options (or share units) cancelled, forfeited, or expired during the current period.

+ References

No definition available.

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X

- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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