Note 4 - Property and Equipment, Net (Details Textual)		3 Months Ended		6 Months Ended
	Feb. 28, 2023 USD ($) ft²	Feb. 28, 2023 USD ($) ft²	Feb. 28, 2022 USD ($)	Feb. 28, 2023 USD ($) ft²	Feb. 28, 2022 USD ($)
Payments to Acquire Property, Plant, and Equipment, Total				$ 1,871,903	$ 618,533
Depreciation, Total		$ 225,962	$ 215,685	488,838	430,991
Depreciation expense		$ 225,962	$ 215,685	$ 488,838	$ 430,991
Property Immediately Adjacent to NTIC’s Headquarters in Circle Pines, Minnesota [Member]
Area of Real Estate Property | ft²	26,000	26,000		26,000
Payments to Acquire Property, Plant, and Equipment, Total	$ 1,200,000