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Note 10 - Share Repurchase Program (Details Textual) $ in Thousands		3 Months Ended		12 Months Ended
	Jul. 07, 2017	Dec. 31, 2018 USD ($) shares	Mar. 31, 2016 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 shares	Dec. 31, 2016 USD ($)	Aug. 15, 2017 shares	Nov. 04, 2015 USD ($) shares	Dec. 31, 2007 shares
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | shares		806,000		806,000			3,300,000	2,000,000	1,000,000
Stock Repurchase Program, Authorized Amount | $		$ 12,600		$ 12,600				$ 40,000
Stock Repurchased and Retired During Period, Shares | shares		200,000	759,302		0
Stock Repurchased and Retired During Period, Value | $		$ 3,800	$ 7,500	$ 3,756		$ 7,513
Stock Split from [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	5
Stock Split To [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	3

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

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

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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).

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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