Represents the number of customers.

No definition available.

Name:	oiim_NumberOfCustomers
Namespace Prefix:	oiim_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of vendors.

+ References

No definition available.

+ Details

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Namespace Prefix:	oiim_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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- Definition

The total expense recognized in the period for promotion, public relations, and brand or product advertising.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Note 2 - Summary of Significant Accounting Policies (Details Textual)		12 Months Ended
	May 06, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Marketing and Advertising Expense, Total		$ 1,105,000	$ 963,000	$ 882,000
Advertising Expense		$ 204,000	$ 198,000	$ 261,000
Paycheck Protection Program CARES Act [Member]
Proceeds from Issuance of Long-term Debt, Total	$ 604,000
Building and Building Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		35 years
Building and Building Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		50 years
Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		3 years
Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		7 years
Furniture and Fixtures [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		3 years
Furniture and Fixtures [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		7 years
Leasehold Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		2 years
Leasehold Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		5 years
Transportation Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)		5 years
Customer Concentration Risk [Member] \| Revenue from Contract with Customer Benchmark [Member]
Number Of Customers		1	2
Customer Concentration Risk [Member] \| Revenue from Contract with Customer Benchmark [Member] \| Customer One [Member]
Concentration Risk, Percentage		15.00%	14.00%
Customer Concentration Risk [Member] \| Revenue from Contract with Customer Benchmark [Member] \| Customer Two [Member]
Concentration Risk, Percentage			11.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Number Of Customers			2
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer One [Member]
Concentration Risk, Percentage		17.00%	9.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer Two [Member]
Concentration Risk, Percentage			19.00%
Supplier Concentration Risk [Member] \| Cost of Goods and Service Benchmark [Member]
Number of Vendors		5	4
Supplier Concentration Risk [Member] \| Cost of Goods and Service Benchmark [Member] \| Vendor One [Member]
Concentration Risk, Percentage		20.00%	32.00%
Supplier Concentration Risk [Member] \| Cost of Goods and Service Benchmark [Member] \| Vendor Two [Member]
Concentration Risk, Percentage		19.00%	19.00%
Supplier Concentration Risk [Member] \| Cost of Goods and Service Benchmark [Member] \| Vendor Three [Member]
Concentration Risk, Percentage		19.00%	11.00%
Supplier Concentration Risk [Member] \| Cost of Goods and Service Benchmark [Member] \| Vendor Four [Member]
Concentration Risk, Percentage		11.00%	10.00%
Supplier Concentration Risk [Member] \| Cost of Goods and Service Benchmark [Member] \| Vendor Five [Member]
Concentration Risk, Percentage		11.00%
Supplier Concentration Risk [Member] \| Accounts Payable [Member]
Number of Vendors		5	4
Supplier Concentration Risk [Member] \| Accounts Payable [Member] \| Vendor One [Member]
Concentration Risk, Percentage		31.00%	18.00%
Supplier Concentration Risk [Member] \| Accounts Payable [Member] \| Vendor Two [Member]
Concentration Risk, Percentage		17.00%	23.00%
Supplier Concentration Risk [Member] \| Accounts Payable [Member] \| Vendor Three [Member]
Concentration Risk, Percentage		21.00%	18.00%
Supplier Concentration Risk [Member] \| Accounts Payable [Member] \| Vendor Four [Member]
Concentration Risk, Percentage		5.00%	12.00%
Supplier Concentration Risk [Member] \| Accounts Payable [Member] \| Vendor Five [Member]
Concentration Risk, Percentage		13.00%