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SHAREHOLDERS' EQUITY, Equity Compensation Plan (Details) | 12 Months Ended
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Aug. 31, 2021 USD ($) item $ / shares shares | Aug. 31, 2020 USD ($) item $ / shares shares | Aug. 31, 2019 USD ($) $ / shares shares
Stock Options [Abstract] |  |  |
Share-based compensation expense | $ | $ 497,000 | $ 517,000 |
2014 Equity Plan [Member] |  |  |
Shareholders' Equity [Abstract] |  |  |
Shares reserved for issuance (in shares) | 1,600,000 |  |
Reserved shares of common stock for issuance (in shares) | 974,965 |  |
Stock awards and awards to purchase shares of common stock (in shares) | 638,500 |  |
Number of shares of common stock outstanding (in shares) | 588,500 |  |
Options expired (in shares) | 0 | 6,500 |
Variable Assumptions Used in Fair Value Calculations [Abstract] |  |  |
Expected term | 7 years 1 month 9 days | 6 years |
Risk-free interest rate | 0.68% | 1.71% |
Expected volatility | 40.01% | 39.32% |
Expected dividend yield | 0.00% | 0.00% |
Weighted average grant-date fair value (in dollars per share) | $ / shares | $ 3.78 | $ 4.19 |
Number of Options [Roll Forward] |  |  |
Exercised (in shares) | (48,535) | (17,500) |
2014 Equity Plan [Member] | Minimum [Member] |  |  |
Variable Assumptions Used in Fair Value Calculations [Abstract] |  |  |
Expected term | 5 years |  |
2014 Equity Plan [Member] | Maximum [Member] |  |  |
Variable Assumptions Used in Fair Value Calculations [Abstract] |  |  |
Expected term | 10 years |  |
2014 Equity Plan [Member] | Employees [Member] |  |  |
Variable Assumptions Used in Fair Value Calculations [Abstract] |  |  |
Weighted average grant-date fair value (in dollars per share) | $ / shares | $ 3.93 | $ 4.21 |
Number of Options [Roll Forward] |  |  |
Granted (in shares) | 85,000 | 80,000 |
Stock Options [Abstract] |  |  |
Vesting period | 5 years | 3 years |
Expiration period | 10 years | 10 years |
2014 Equity Plan [Member] | Executive Officer [Member] |  |  |
Variable Assumptions Used in Fair Value Calculations [Abstract] |  |  |
Weighted average grant-date fair value (in dollars per share) | $ / shares | $ 3.37 | $ 4.16 |
Number of Options [Roll Forward] |  |  |
Granted (in shares) | 30,000 | 50,000 |
Stock Options [Abstract] |  |  |
Vesting period | 3 years |  |
Expiration period | 10 years | 10 years |
2014 Equity Plan [Member] | Non-Employee Board Members [Member] |  |  |
Number of Options [Roll Forward] |  |  |
Granted (in shares) | 2,000 | 2,000 |
Stock Options [Abstract] |  |  |
Number of board members | item | 6 | 6 |
Stock price (in dollars per share) | $ / shares | $ 11.33 | $ 12.45 |
Share-based compensation expense | $ | $ 100,000 | $ 100,000 |
2004 Incentive Plan and 2014 Equity Plan [Member] |  |  |
Shareholders' Equity [Abstract] |  |  |
Stock awards and awards to purchase shares of common stock (in shares) | 24,035 |  |
Number of shares of common stock outstanding (in shares) | 126,000 |  |
Variable Assumptions Used in Fair Value Calculations [Abstract] |  |  |
Weighted average grant-date fair value (in dollars per share) | $ / shares | $ 3.78 | $ 4.19 |
Number of Options [Roll Forward] |  |  |
Outstanding, beginning of period (in shares) | 661,500 | 555,500 |
Granted (in shares) | 115,000 | 130,000 |
Exercised (in shares) | (24,500) | (17,500) |
Forfeited or expired (in shares) | (37,500) | (6,500) |
Outstanding, end of period (in shares) | 714,500 | 661,500 | 555,500
Options exercisable (in shares) | 496,167 |  |
Weighted Average Exercise Price [Roll Forward] |  |  |
Outstanding, beginning of period (in dollars per share) | $ / shares | $ 7.23 | $ 6.33 |
Granted (in dollars per share) | $ / shares | 9.00 | 10.41 |
Exercised (in dollars per share) | $ / shares | 3.66 | 2.81 |
Forfeited or expired (in dollars per share) | $ / shares | 3.99 | 6.08 |
Outstanding, end of period (in dollars per share) | $ / shares | 7.80 | $ 7.23 | $ 6.33
Options exercisable (in dollars per share) | $ / shares | $ 6.96 |  |
Stock Options [Abstract] |  |  |
Weighted average remaining contractual term | 6 years 21 days | 6 years 2 months 1 day | 6 years 3 months 7 days
Weighted average remaining contractual term, options exercisable | 4 years 11 months 19 days |  |
Approximate aggregate intrinsic value | $ | $ 5,107 | $ 1,831 | $ 2,528
Approximate aggregate intrinsic value, options exercisable | $ | $ 3,966 |  |
Share-based compensation expense | $ |  | $ 500,000 |
Options cancelled (in shares) | 13,465 |  |
Net settlement exercised (in shares) |  | 0 |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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 (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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