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Note 16 - Working Capital Line of Credit and Overdraft Facility (Details Textual) - Wells Fargo Bank N.A [Member]
£ in Millions
Oct. 05, 2016
Sep. 27, 2013
Jun. 30, 2018
USD ($)
Jun. 30, 2018
GBP (£)
Revolving Credit Facility [Member] | CUI, Inc [Member]        
Line of Credit Facility, Expiration Period   2 years    
Capital Expenditures Exceed Limit     $ 1,750,000  
Line of Credit Facility, Maximum Borrowing Capacity     4,000,000  
Multi-currency Variable Rate Overdraft Facility [Member]        
Line of Credit Facility, Expiration Period 5 years      
Long-term Line of Credit, Total     736,000  
Line of Credit Facility, Maximum Borrowing Capacity     1,980,000 £ 1.5
Multi-currency Variable Rate Overdraft Facility [Member] | CUI, Inc [Member]        
Long-term Line of Credit, Total     $ 0