Note 3 - Disaggregation of Revenue - Disaggregated Revenue From External Customer (Details) - USD ($)	3 Months Ended
	Feb. 28, 2021	Feb. 29, 2020
Revenue	$ 5,401,000	$ 5,026,000
Farm Equipment [Member]
Revenue	2,777,000	2,349,000
Farm Equipment Service Parts [Member]
Revenue	620,000	532,000
Steel Cutting Tools and Inserts [Member]
Revenue	606,000	609,000
Modular Buildings [Member]
Revenue	1,141,000	1,271,000
Modular Buildings Lease Income [Member]
Revenue		156,000
Product and Service, Other [Member]
Revenue	257,000	109,000
Agricultural Products [Member]
Revenue	3,500,000	2,953,000
Agricultural Products [Member] | Farm Equipment [Member]
Revenue	2,777,000	2,349,000
Agricultural Products [Member] | Farm Equipment Service Parts [Member]
Revenue	620,000	532,000
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	103,000	72,000
Modular Buildings [Member]
Revenue	1,291,000	1,457,000
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	1,141,000	1,271,000
Modular Buildings [Member] | Modular Buildings Lease Income [Member]
Revenue		156,000
Modular Buildings [Member] | Product and Service, Other [Member]
Revenue	150,000	30,000
Tools [Member]
Revenue	610,000	616,000
Tools [Member] | Farm Equipment [Member]
Revenue
Tools [Member] | Farm Equipment Service Parts [Member]
Revenue
Tools [Member] | Steel Cutting Tools and Inserts [Member]
Revenue	606,000	609,000
Tools [Member] | Modular Buildings [Member]
Revenue
Tools [Member] | Modular Buildings Lease Income [Member]
Revenue
Tools [Member] | Product and Service, Other [Member]
Revenue	$ 4,000	$ 7,000