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Note 14 - Stockholders' Equity (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Feb. 13, 2019	Feb. 14, 2018	Mar. 01, 2017
Stock Buyback Program 2019 [Member]
Stock Repurchase Program, Authorized Amount			$ 40
Stock Repurchased and Retired During Period, Shares	0
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

X

- 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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