Note 12 - Sales-type Leases (Details Textual) - USD ($)	3 Months Ended	9 Months Ended
Aug. 31, 2018	Aug. 31, 2018
Capital Leases, Income Statement, Sales Type Lease Revenue	$ 0	$ 129,104

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