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Note 18 - Quarterly Results of Operations (Unaudited) - Schedule of Quarterly Financial Information (Details) - USD ($)	3 Months Ended								12 Months Ended
	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Net sales	$ 17,206,880	$ 16,432,243	$ 15,847,473	$ 14,606,252	$ 17,312,823	$ 16,915,135	$ 16,340,153	$ 14,047,890	$ 64,092,848	$ 64,616,001	$ 73,568,738
Gross profit	5,018,702	5,305,787	5,663,039	4,810,399	6,209,719	5,461,691	4,551,295	3,502,431	20,797,927	19,725,136	21,795,887
Selling, general and administrative expenses	5,451,589	5,426,018	5,898,502	5,192,648	5,246,838	5,074,839	5,351,577	5,087,481	21,968,757	20,760,735	24,042,554
Loss before income taxes	(595,507)	(281,065)	(231,270)	(636,367)	759,876	181,003	(992,653)	(1,743,321)	(1,744,209)	(1,795,095)	(2,815,063)
Net loss attributable to	$ (588,762)	$ (295,160)	$ (239,082)	$ (615,767)	$ 761,158	$ 188,163	$ (983,122)	$ (1,745,021)	$ (1,738,771)	$ (1,778,822)	$ (4,255,665)
Net loss attributable to Optical Cable Corporation per share - basic and diluted (in dollars per share)	$ (0.09)	$ (0.05)	$ (0.04)	$ (0.09)	$ 0.11	$ 0.03	$ (0.15)	$ (0.28)	$ (0.27)	$ (0.28)	$ (0.69)

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- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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