Note 11 - Leasing Arrangements (Details Textual) - USD ($)	3 Months Ended
	May 31, 2019	May 31, 2018	Mar. 01, 2019	Feb. 28, 2019
Operating Lease, Expense	$ 238,666	$ 265,426
Operating Lease, Liability, Total	$ 3,280,508
Operating Lease, Weighted Average Discount Rate, Percent	3.40%
Lessee, Operating Lease, Liability, Payments, Due, Total	$ 3,647,945
Operating Lease, Right-of-Use Asset	$ 3,280,508
Accounting Standards Update 2016-02 [Member]
Operating Lease, Liability, Total			$ 3,300,000
Operating Lease, Right-of-Use Asset			$ 3,300,000
Maximum [Member]
Lessee, Operating Lease, Term of Contract	10 years
Lessee, Operating Lease, Renewal Term	10 years
Minimum [Member]
Lessee, Operating Lease, Renewal Term	5 years