Note 3 - Disaggregation of Revenue - Disaggregated Revenue From External Customer (Details) - USD ($)	3 Months Ended		9 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019
Revenue	$ 6,465,000	$ 5,504,000	$ 16,937,000	$ 15,375,000
Farm Equipment [Member]
Revenue	2,908,000	2,392,000	7,556,000	7,274,000
Farm Equipment Service Parts [Member]
Revenue	645,000	666,000	1,844,000	1,880,000
Steel Cutting Tools and Inserts [Member]
Revenue	470,000	499,000	1,648,000	1,527,000
Modular Buildings [Member]
Revenue	2,266,000	1,607,000	5,155,000	3,773,000
Modular Buildings Lease Income [Member]
Revenue		165,000	318,000	512,000
Product and Service, Other [Member]
Revenue	176,000	175,000	416,000	409,000
Agricultural Products [Member]
Revenue	3,671,000	3,194,000	9,695,000	9,441,000
Agricultural Products [Member] | Farm Equipment [Member]
Revenue	2,908,000	2,392,000	7,556,000	7,274,000
Agricultural Products [Member] | Farm Equipment Service Parts [Member]
Revenue	645,000	666,000	1,844,000	1,880,000
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	118,000	136,000	295,000	287,000
Modular Buildings [Member]
Revenue	2,319,000	1,802,000	5,575,000	4,382,000
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	2,266,000	1,607,000	5,155,000	3,773,000
Modular Buildings [Member] | Modular Buildings Lease Income [Member]
Revenue		165,000	318,000	512,000
Modular Buildings [Member] | Product and Service, Other [Member]
Revenue	53,000	30,000	102,000	97,000
Tools [Member]
Revenue	475,000	508,000	1,667,000	1,552,000
Tools [Member] | Farm Equipment [Member]
Revenue
Tools [Member] | Farm Equipment Service Parts [Member]
Revenue
Tools [Member] | Steel Cutting Tools and Inserts [Member]
Revenue	470,000	499,000	1,648,000	1,527,000
Tools [Member] | Modular Buildings [Member]
Revenue
Tools [Member] | Modular Buildings Lease Income [Member]
Revenue
Tools [Member] | Product and Service, Other [Member]
Revenue	$ 5,000	$ 9,000	$ 19,000	$ 25,000