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Note 2 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2017
Sep. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Jun. 30, 2018
Payments to Acquire Businesses, Net of Cash Acquired               $ 10,397 $ 24,660    
Goodwill   $ 242,690   $ 249,685       249,685   $ 249,685  
Business Combination, Acquisition Related Costs           $ 800 303 800    
Amortization of Intangible Assets       2,300     1,100 4,500 2,000    
Interest Expense       1,793     850 3,514 1,547    
Business Combination, Contingent Consideration, Liability [1]   2,108   3,513       3,513   3,513  
Business Combination, Deferred Compensation Arrangements       703     703 1,405 703    
Piazza Rosa Group [Member]                      
Payments to Acquire Businesses, Net of Cash Acquired $ 10,056     10,056 $ 10,100            
Other Payments to Acquire Businesses 2,833     2,833 2,800            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 4,087     4,086 4,087     4,086   4,086  
Goodwill, Purchase Accounting Adjustments       1,155              
Goodwill 6,218     5,063 6,218     5,063   5,063  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles       1              
Piazza Rosa Group [Member] | Trademarks (Indefinite-Lived) [Member]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 1,600       1,600            
Piazza Rosa Group [Member] | Customer Relationships [Member]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 2,300       $ 2,300            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life         8 years            
Piazza Rosa Group [Member] | Other Intangible Assets [Member]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 200       $ 200            
Standex Electronics Japan Corporation [Member]                      
Payments to Acquire Businesses, Net of Cash Acquired     $ 129,155     $ 129,200   129,155      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     53,800 51,400   53,800   51,400   51,400  
Goodwill, Purchase Accounting Adjustments                   3,202  
Goodwill     $ 75,985 79,187   $ 75,985   79,187   79,187  
Business Acquisition, Percentage of Voting Interests Acquired     100.00%     100.00%          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Pension                   1,900  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles                   $ (2,400)  
Standex Electronics Japan Corporation [Member] | Acquisition-related Costs [Member]                      
Business Combination, Acquisition Related Costs       200              
Standex Electronics Japan Corporation [Member] | Fair Value Adjustment to Intangible Assets [Member]                      
Business Combination, Acquisition Related Costs                 200    
Amortization of Intangible Assets             700   1,400    
Interest Expense                 700    
Standex Electronics Japan Corporation [Member] | Fair Value Adjustment to Fixed Assets [Member]                      
Depreciation             300   600    
Standex Electronics Japan Corporation [Member] | Fair Value Adjustment to Credit Facility [Member]                      
Business Combination, Acquisition Related Costs             200        
Interest Expense             400        
Standex Electronics Japan Corporation [Member] | Customer Relationships [Member]                      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life                   15 years  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       3,400       3,400   $ 3,400  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles                   (200)  
Standex Electronics Japan Corporation [Member] | Developed Technology Rights [Member]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       47,800       47,800   47,800  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles                   $ (2,300)  
Standex Electronics Japan Corporation [Member] | Developed Technology Rights [Member] | Minimum [Member]                      
Finite-Lived Intangible Asset, Useful Life                   10 years  
Standex Electronics Japan Corporation [Member] | Developed Technology Rights [Member] | Maximum [Member]                      
Finite-Lived Intangible Asset, Useful Life                   20 years  
Standex Electronics Japan Corporation [Member] | Order or Production Backlog [Member]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       200       200   $ 200  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles                   $ 100  
Horizon Scientific Inc. [Member]                      
Payments to Acquire Businesses, Net of Cash Acquired   25,001         25,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   16,150         $ 16,200   $ 16,200    
Goodwill   $ 6,660                  
Business Acquisition, Percentage of Voting Interests Acquired             100.00%   100.00%    
Business Combination, Contingent Consideration, Liability             $ 8,400   $ 8,400    
Business Combination, Deferred Compensation Due on Second Anniversary             2,800   2,800    
Business Combination, Deferred Compensation Due on Third Anniversary             5,600   5,600    
Business Combination, Deferred Compensation Arrangements       $ 700       $ 1,400      
Horizon Scientific Inc. [Member] | Scenario, Forecast [Member]                      
Payments for Previous Acquisition                     $ 300
Horizon Scientific Inc. [Member] | Customer Relationships [Member]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill             $ 14,500   14,500    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life             15 years        
Horizon Scientific Inc. [Member] | Order or Production Backlog [Member]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles             $ 300   300    
Horizon Scientific Inc. [Member] | Trademarks [Member]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill             $ 1,400   $ 1,400    
[1] The fair value of our contingent consideration arrangement is determined based on our evaluation as to the probability and amount of any deferred compensation that has been earned to date.