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Note 12 - Stockholders' Equity (Details Textual) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Mar. 01, 2017	Feb. 09, 2016	Feb. 11, 2015
Stock Buyback Program 2017 [Member]
Stock Repurchase Program, Authorized Amount				$ 40.0
Stock Repurchased and Retired During Period, Shares	0	0
Stock Buyback Program 2016 [Member]
Stock Repurchase Program, Authorized Amount					$ 40.0
Stock Repurchased and Retired During Period, Shares			308,416
Stock Repurchased and Retired During Period, Value			$ 7.2
Stock Buyback Program 2015 [Member]
Stock Repurchase Program, Authorized Amount						$ 20.0
Stock Repurchased and Retired During Period, Shares			0

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

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-Publisher FASB
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