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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.

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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