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Note 13 - Stockholders' Equity (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Feb. 14, 2018	Mar. 01, 2017	Feb. 09, 2016
Stock Repurchased and Retired During Period, Shares	0	0
Stock Buyback Program 2018 [Member]
Stock Repurchase Program, Authorized Amount			$ 40
Stock Repurchased and Retired During Period, Shares	0
Stock Buyback Program 2017 [Member]
Stock Repurchase Program, Authorized Amount				$ 40
Stock Repurchased and Retired During Period, Shares	0
Stock Buyback Program 2016 [Member]
Stock Repurchase Program, Authorized Amount					$ 40
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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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