Note 3 - Disaggregation of Revenue - Disaggregated Revenue From External Customer (Details) - USD ($)	3 Months Ended
	Feb. 29, 2020	Feb. 28, 2019
Revenue	$ 5,026,000	$ 4,124,000
Farm Equipment [Member]
Revenue	2,349,000	2,092,000
Farm Equipment Service Parts [Member]
Revenue	532,000	460,000
Steel Cutting Tools and Inserts [Member]
Revenue	609,000	484,000
Modular Buildings [Member]
Revenue	1,271,000	795,000
Modular Buildings Lease Income [Member]
Revenue	156,000	179,000
Product and Service, Other [Member]
Revenue	109,000	114,000
Agricultural Products [Member]
Revenue	2,953,000	2,610,000
Agricultural Products [Member] | Farm Equipment [Member]
Revenue	2,349,000	2,092,000
Agricultural Products [Member] | Farm Equipment Service Parts [Member]
Revenue	532,000	460,000
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	72,000	58,000
Modular Buildings [Member]
Revenue	1,457,000	1,022,000
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	1,271,000	795,000
Modular Buildings [Member] | Modular Buildings Lease Income [Member]
Revenue	156,000	179,000
Modular Buildings [Member] | Product and Service, Other [Member]
Revenue	30,000	48,000
Tools [Member]
Revenue	616,000	492,000
Tools [Member] | Farm Equipment [Member]
Revenue
Tools [Member] | Farm Equipment Service Parts [Member]
Revenue
Tools [Member] | Steel Cutting Tools and Inserts [Member]
Revenue	609,000	484,000
Tools [Member] | Modular Buildings [Member]
Revenue
Tools [Member] | Modular Buildings Lease Income [Member]
Revenue
Tools [Member] | Product and Service, Other [Member]
Revenue	$ 7,000	$ 8,000