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Note 11 - Treasury Stock and Repurchase Program (Details Textual) - USD ($)		1 Months Ended		3 Months Ended			6 Months Ended		73 Months Ended
	Oct. 31, 2018	Jan. 30, 2012	Jan. 31, 2011	Oct. 31, 2018	Jul. 31, 2018	[1]	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 19, 2018	Sep. 19, 2012
Treasury Stock, Shares, Acquired					2,286
Treasury Stock, Value, Acquired, Cost Method					$ 46,000		$ 46,000	$ 150,000
October 2018 Share Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount										$ 2,000,000
Treasury Stock, Shares, Acquired	0
Former Repurchase Program [Member]
Treasury Stock, Shares, Acquired		85,219
Treasury Stock, Value, Acquired, Cost Method		$ 1,036,000
January 2011 Share Repurchase Program [Member]
Treasury Stock, Shares, Acquired			18,400
September 2012 Share Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount											$ 3,000,000
Treasury Stock, Shares, Acquired									207,047
Treasury Stock, Value, Acquired, Cost Method									$ 2,792,000
[1] Includes 207,047 shares with a total average cost of $2,792,000 that were acquired during the $3 million repurchase program which was authorized in September 2012 and expired in October 2019.

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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-Section S99
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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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