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Note 10 - Stock-based Compensation (Tables) | 12 Months Ended
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Aug. 31, 2019
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Fiscal Year 2019 |  | Fiscal Year 2018
Dividend yield |  |  | 1.32 | % |  |  | 2.18 | %
Expected volatility |  |  | 45.8 | % |  |  | 45.9 | %
Expected life of option (years) |  |  | 10 |  |  |  | 10 |
Weighted average risk-free interest rate |  |  | 2.75 | % |  |  | 1.87 | %
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of Shares (#) |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value
Outstanding at August 31, 2017 |  |  | 615,716 |  |  |  | 6.97 |  |  |  |  |
Options granted |  |  | 94,504 |  |  |  | 9.18 |  |  |  |  |
Options exercised |  |  | (12,814 | ) |  |  | 5.80 |  |  |  |  |
Options terminated |  |  | — |  |  |  | — |  |  |  |  |
Outstanding at August 31, 2018 |  |  | 697,406 |  |  |  | 7.29 |  |  |  |  |
Options granted |  |  | 141,767 |  |  |  | 18.23 |  |  |  |  |
Options exercised |  |  | — |  |  |  | — |  |  |  |  |
Options terminated |  |  | — |  |  |  | — |  |  |  |  |
Outstanding at August 31, 2019 |  |  | 839,173 |  |  | $ | 9.13 |  |  | $ | 2,610,422 |
Exercisable at August 31, 2019 |  |  | 640,617 |  |  | $ | 7.20 |  |  | $ | 2,403,847 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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