Note 3 - Revenue Recognition - Disaggregated Revenue From External Customer (Details) - USD ($)	3 Months Ended		9 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2019	Aug. 31, 2018
Revenue	$ 5,504,000	$ 5,280,000	$ 15,375,000	$ 15,940,000
Farm Equipment [Member]
Revenue	2,392,000	3,005,000	7,274,000	9,395,000
Farm Equipment Service Parts [Member]
Revenue	666,000	768,000	1,880,000	2,036,000
Steel Cutting Tools and Inserts [Member]
Revenue	499,000	586,000	1,527,000	1,789,000
Modular Buildings [Member]
Revenue	1,607,000	568,000	3,773,000	1,981,200
Modular Buildings Lease Income [Member]
Revenue	165,000	126,000	512,000	242,000
Product and Service, Other [Member]
Revenue	175,000	227,000	409,000	496,800
Agricultural Products [Member]
Revenue	3,194,000	3,913,000	9,441,000	11,778,000
Agricultural Products [Member] | Farm Equipment [Member]
Revenue	2,392,000	3,005,000	7,274,000	9,395,000
Agricultural Products [Member] | Farm Equipment Service Parts [Member]
Revenue	666,000	768,000	1,880,000	2,036,000
Agricultural Products [Member] | Steel Cutting Tools and Inserts [Member]
Revenue
Agricultural Products [Member] | Modular Buildings [Member]
Revenue
Agricultural Products [Member] | Modular Buildings Lease Income [Member]
Revenue
Agricultural Products [Member] | Product and Service, Other [Member]
Revenue	136,000	140,000	287,000	347,000
Modular Buildings [Member]
Revenue	1,802,000	773,000	4,382,000	2,346,000
Modular Buildings [Member] | Farm Equipment [Member]
Revenue
Modular Buildings [Member] | Farm Equipment Service Parts [Member]
Revenue
Modular Buildings [Member] | Steel Cutting Tools and Inserts [Member]
Revenue
Modular Buildings [Member] | Modular Buildings [Member]
Revenue	1,607,000	568,000	3,773,000	1,981,200
Modular Buildings [Member] | Modular Buildings Lease Income [Member]
Revenue	165,000	126,000	512,000	242,000
Modular Buildings [Member] | Product and Service, Other [Member]
Revenue	30,000	79,000	97,000	122,800
Tools [Member]
Revenue	508,000	594,000	1,552,000	1,816,000
Tools [Member] | Farm Equipment [Member]
Revenue
Tools [Member] | Farm Equipment Service Parts [Member]
Revenue
Tools [Member] | Steel Cutting Tools and Inserts [Member]
Revenue	499,000	586,000	1,527,000	1,789,000
Tools [Member] | Modular Buildings [Member]
Revenue
Tools [Member] | Modular Buildings Lease Income [Member]
Revenue
Tools [Member] | Product and Service, Other [Member]
Revenue	$ 9,000	$ 8,000	$ 25,000	$ 27,000