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Note 13 - Stockholders' Equity (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Feb. 14, 2018	Mar. 01, 2017	Feb. 09, 2016
Stock Buyback Program 2018 [Member]
Stock Repurchase Program, Authorized Amount					$ 40
Stock Repurchased and Retired During Period, Shares	0		0
Stock Buyback Program 2017 [Member]
Stock Repurchase Program, Authorized Amount						$ 40
Stock Repurchased and Retired During Period, Shares		0	0	0
Stock Buyback Program 2016 [Member]
Stock Repurchase Program, Authorized Amount							$ 40
Stock Repurchased and Retired During Period, Shares				0

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- Definition

Amount of stock repurchase plan authorized.

+ References

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

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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