Note 3 - Revenue From Contracts With Customers - Remaining Performance Obligation 2 (Details)	Aug. 31, 2020 USD ($)
Revenue, remaining performance obligation, amount	$ 1,076,497
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-09-01
Revenue, remaining performance obligation, period (Year)	182 days
Revenue, remaining performance obligation, amount	$ 94,959
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-03-01
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, remaining performance obligation, amount	$ 182,079
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-03-01
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, remaining performance obligation, amount	$ 170,353
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-03-01
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, remaining performance obligation, amount	$ 137,744
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-03-01
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, remaining performance obligation, amount	$ 124,461
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-03-01
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, remaining performance obligation, amount	$ 366,901