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Note 18 - Subsequent Events (Details Textual) - USD ($) |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 20, 2021 | Sep. 01, 2021 | Aug. 31, 2021 | Jul. 21, 2021 | Apr. 23, 2021 | Jan. 15, 2021 | Jan. 22, 2020 | Oct. 22, 2019 | Nov. 30, 2020 | Aug. 31, 2020 | May 31, 2020 | Aug. 31, 2021 | Aug. 31, 2020 | Aug. 30, 2021
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  |  | $ 0.065 | $ 0.065 | $ 0.065 | $ 0.065 | $ 0.065 | $ 0 | $ 0 | $ 0 | $ 0.20 | $ 0.13 |
Dividends Payable, Date to be Paid |  |  |  | Aug. 18, 2021 | May 19, 2021 | Feb. 17, 2021 | Feb. 19, 2020 | Nov. 20, 2019 |  |  |  |  |  |
Dividends Payable, Date of Record |  |  |  | Aug. 04, 2021 | May 05, 2021 | Feb. 03, 2021 | Feb. 05, 2020 | Nov. 06, 2019 |  |  |  |  |  |
Revolving Credit Facility [Member] | PNC Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  | $ 5,000,000 |  | $ 3,000,000
Revolving Credit Facility [Member] | PNC Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.07 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid | Nov. 17, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date of Record | Nov. 03, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Acquisition of Remaining Ownership Interest in Harita-NTI Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 6,250,000 |  |  |  |  |  |  |  |  |  |  |  |

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