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Note G - Pension and Other Postretirement Benefits - Allocation of Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Plan Fair Value Assets	$ 83,318	$ 68,275
Plan Fair Value Assets, Percentage	100.00%	100.00%
Fair Value, Inputs, Level 1 [Member]
Plan Fair Value Assets	$ 42,691	$ 22,863
Plan Fair Value Assets, Percentage	51.00%	33.00%
Fair Value, Inputs, Level 2 [Member]
Plan Fair Value Assets	$ 40,597	$ 45,412
Plan Fair Value Assets, Percentage	49.00%	67.00%
Fair Value, Inputs, Level 3 [Member]
Plan Fair Value Assets	$ 30
Plan Fair Value Assets, Percentage
Equity Securities [Member]
Plan Fair Value Assets, Percentage
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Plan Fair Value Assets	$ 19,752	$ 16,908
Plan Fair Value Assets, Percentage	24.00%	25.00%
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Plan Fair Value Assets	$ 30
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Plan Fair Value Assets	$ 11,805	$ 1,468
Plan Fair Value Assets, Percentage	14.00%	2.00%
Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Plan Fair Value Assets	$ 40,597	$ 41,984
Plan Fair Value Assets, Percentage	49.00%	62.00%
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Plan Fair Value Assets		$ 3,476
Plan Fair Value Assets, Percentage		5.00%
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Plan Fair Value Assets	$ 11,134	$ 1,011
Plan Fair Value Assets, Percentage	13.00%	1.00%
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Plan Fair Value Assets		$ 3,428
Plan Fair Value Assets, Percentage		5.00%

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6749337

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6520858

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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