Note 3 - Revenue From Contracts With Customers - Remaining Performance Obligation 2 (Details)	May 31, 2022 USD ($)
Revenue, remaining performance obligation, amount	$ 1,116,088
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-06-01
Revenue, remaining performance obligation, period (Year)	9 months
Revenue, remaining performance obligation, amount	$ 154,951
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	$ 172,857
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	$ 157,873
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	$ 145,751
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-03-01
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, remaining performance obligation, amount	$ 129,060
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-03-01
Revenue, remaining performance obligation, period (Year)	1 year
Revenue, remaining performance obligation, amount	$ 355,596