Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)		9 Months Ended	12 Months Ended
		Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014	Jun. 30, 2013
Significant Accounting Policies [Line Items]
Inventory, finished goods		$ 5,776,916	$ 5,610,039	$ 5,776,916
Inventory, raw materials		$ 1,290,851	$ 1,624,971	$ 1,290,851
Number of common shares obtained			352,589
Percentage of ownership interests		8.62%	8.50%	8.62%	11.54%	8.94%	11.54%
Allowance for doubtful accounts		$ 285,348	$ 253,871	$ 285,348
Inventory net		7,027,644	6,840,845	7,027,644
Cash and cash equivalents in foreign accounts		137,156	132,022	137,156
Cash and cash equivalents covered under FDIC insured deposits programs		2,964,871	2,090,952	2,964,871
Billings in excess of cost		6,787,231	3,623,906	6,787,231
Concentration risk, percentage					45.00%
Unrealized (loss) on derivative			(171,880)	(427,818)	$ 0
Inventory, allowance		549,981	$ 394,165	549,981
Property Plant And Equipment Useful Life			Lesser of lease term or 10 years
Inventory, Work in Process, Net of Reserves		509,858		509,858
Short-term Investments, Total		10,868,961	$ 11,159,765	10,868,961
Cash SIPC Insured Amount			500,000
Advertising Costs Offset Against Revenue			300,000	300,000	0
Costs in Excess of Billings, Current		552,012	0	552,012
Product Warranty Accrual		200,000	0	200,000
Advertising Expense			$ 1,300,000	$ 1,100,000	$ 900,000
Stock Issued During Period, Shares, Issued for Services			1,302	11,804	61,596
Shipping and Handling Revenue			$ 42,000	$ 41,000	$ 54,000
Income Taxes Receivable		0	300,000	0
Depreciation and amortization expense				268,287	250,837
Deferred Tax Liabilities, Net					2,800,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property			$ (26,488)	(9,648)	0
Distributor One
Significant Accounting Policies [Line Items]
Concentration risk, percentage			30.00%
Distributor Two
Significant Accounting Policies [Line Items]
Concentration risk, percentage			4.00%
Held-to-maturity Securities
Significant Accounting Policies [Line Items]
Short-term Investments, Total		10,868,961	$ 11,159,765	10,868,961
CUI, Inc
Significant Accounting Policies [Line Items]
Defined Benefit Plan, Contributions by Employer			271,813	245,594	$ 215,118
Orbital Gas Systems Limited
Significant Accounting Policies [Line Items]
Defined Benefit Plan, Contributions by Employer		106,121	$ 255,773
Defined Benfit Plan Contribution By Employer Percenage			5.00%
CUI Japan
Significant Accounting Policies [Line Items]
Defined Benfit Plan Contribution By Employer Percenage			6.00%
European Foreign Bank
Significant Accounting Policies [Line Items]
Cash, uninsured amount		6,984,417	$ 2,531,689	6,984,417
Japanese Foreign Bank
Significant Accounting Policies [Line Items]
Cash, uninsured amount		108,747	64,411	108,747
Certificates of Deposit
Significant Accounting Policies [Line Items]
Short-term Investments, Total		$ 9,750,000	$ 6,845,000	$ 9,750,000
Technology rights
Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	[1],[2]		20 years

[1] All intangibles are reviewed annually for impairment, or sooner if circumstances change.

[2] Technology rights are amortized over a twenty year life or the term of the rights agreement.