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Note I - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statute of Limitations			3 years
Income Tax Examination, Penalties and Interest Expense			$ 0	$ 0
Effective Income Tax Rate Reconciliation, Percent	38.60%	38.40%	38.70%	38.10%
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] | Earliest Tax Year [Member]
Open Tax Year			2013

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Number of years for the statute of limitations to run.

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

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-Name Accounting Standards Codification
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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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