Note 2 - Acquisitions - Unaudited Pro Forma Information (Details) - Standex Electronics Japan Corporation [Member] - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	[1]
Net Sales	$ 868,382	$ 805,235
Net Income	$ 36,823	$ 57,810
Basic (in dollars per share)	$ 2.90	$ 4.56
Diluted (in dollars per share)	$ 2.88	$ 4.53

[1] Fiscal year 2017 unaudited pro-forma results have been recast as a result of the adoption of Accounting Standards Update (ASU) 2016-09, Improvements to Employee Share-Based Payment Accounting.