Note 13 - Sales-type Leases (Details Textual) - USD ($)	3 Months Ended
Feb. 28, 2019	Feb. 28, 2018
Capital Leases, Income Statement, Sales Type Lease Revenue	$ 0	$ 426,542

Revenue realized in the period on sales type leases.

No definition available.

Name:	us-gaap_CapitalLeasesIncomeStatementSalesTypeLeaseRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration