Note 3 - Disaggregation of Revenue - Disaggregated Revenue From External Customer (Details) - USD ($)	3 Months Ended		9 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2021	Aug. 31, 2020
Revenue	$ 6,592,000	$ 6,465,000	$ 17,703,000	$ 16,937,000
Farm Equipment [Member]
Revenue	3,831,000	2,908,000	9,723,000	7,556,000
Farm Equipment Service Parts [Member]
Revenue	749,000	645,000	2,027,000	1,844,000
Steel Cutting Tools and Inserts [Member]
Revenue	613,000	470,000	1,872,000	1,648,000
Modular Buildings [Member]
Revenue	1,256,000	2,266,000	3,573,000	5,155,000
Product and Service, Other [Member]
Revenue	143,000	176,000	508,000	416,000
Modular Buildings Lease Income [Member]
Revenue			0	318,000
Agricultural Products [Member]
Revenue	4,660,000	3,671,000	12,017,000	9,695,000
Agricultural Products [Member] | Farm Equipment [Member]
Revenue	3,831,000	2,908,000	9,723,000	7,556,000
Agricultural Products [Member] | Farm Equipment Service Parts [Member]
Revenue	749,000	645,000	2,027,000	1,844,000
Agricultural Products [Member] | Steel Cutting Tools and Inserts [Member]
Revenue	0	0	0	0
Agricultural Products [Member] | Modular Buildings [Member]
Revenue	0	0	0	0
Agricultural Products [Member] | Product and Service, Other [Member]
Revenue	80,000	118,000	267,000	295,000
Agricultural Products [Member] | Modular Buildings Lease Income [Member]
Revenue			0	0
Modular Buildings [Member]
Revenue	1,313,000	2,319,000	3,798,000	5,575,000
Modular Buildings [Member] | Farm Equipment [Member]
Revenue	0	0	0	0
Modular Buildings [Member] | Farm Equipment Service Parts [Member]
Revenue	0	0	0	0
Modular Buildings [Member] | Steel Cutting Tools and Inserts [Member]
Revenue	0	0	0	0
Modular Buildings [Member] | Modular Buildings [Member]
Revenue	1,256,000	2,266,000	3,573,000	5,155,000
Modular Buildings [Member] | Product and Service, Other [Member]
Revenue	57,000	53,000	225,000	102,000
Modular Buildings [Member] | Modular Buildings Lease Income [Member]
Revenue			0	318,000
Tools [Member]
Revenue	619,000	475,000	1,888,000	1,667,000
Tools [Member] | Farm Equipment [Member]
Revenue	0	0	0	0
Tools [Member] | Farm Equipment Service Parts [Member]
Revenue	0	0	0	0
Tools [Member] | Steel Cutting Tools and Inserts [Member]
Revenue	613,000	470,000	1,872,000	1,648,000
Tools [Member] | Modular Buildings [Member]
Revenue	0	0	0	0
Tools [Member] | Product and Service, Other [Member]
Revenue	$ 6,000	$ 5,000	16,000	19,000
Tools [Member] | Modular Buildings Lease Income [Member]
Revenue			$ 0	$ 0