Note 9 - Debt (Details Textual) $ in Thousands, د.إ in Millions, ج.م. in Millions, $ in Millions							1 Months Ended	3 Months Ended		7 Months Ended	18 Months Ended
	Sep. 17, 2021 USD ($)	Apr. 14, 2021 USD ($)	Dec. 17, 2020 USD ($)	Jul. 28, 2016 USD ($)	Jul. 28, 2016 CAD ($)	Jun. 19, 2012 USD ($)	Apr. 30, 2022 USD ($)	Apr. 30, 2022 USD ($)	Apr. 30, 2021 USD ($)	Apr. 30, 2022 USD ($)	Apr. 30, 2022 USD ($)	Apr. 30, 2022 AED (د.إ)	Jan. 31, 2022 USD ($)	Dec. 31, 2021 EGP (ج.م.)	Jun. 30, 2021 EGP (ج.م.)	Sep. 20, 2018 USD ($)
Debt and Lease Obligation, Total							$ 26,300	$ 26,300		$ 26,300	$ 26,300		$ 21,900
Line of Credit, Current							$ 5,246	$ 5,246		$ 5,246	$ 5,246		634
Line of Credit Facility, Interest Rate at Period End							4.50%	4.50%		4.50%	4.50%	4.50%
Line of Credit Facility, Current Borrowing Capacity							$ 4,900	$ 4,900		$ 4,900	$ 4,900
Proceeds from Sale of Property, Plant, and Equipment, Total								70	$ 0
Repayments of Secured Debt								(0)	$ 892
Finance Lease, Liability, Noncurrent							$ 9,301	$ 9,301		$ 9,301	$ 9,301		9,327
Mortgage Note Secured by Tennessee Manufacturing Facility [Member]
Repayments of Secured Debt		$ 900
Debt Instrument, Issuance Date						Jun. 19, 2012
Proceeds from Issuance of Secured Debt						$ 1,800
Canadian Mortgage Note [Member]
Proceeds from Issuance of Debt				$ 6,100	$ 8
Debt Instrument, Maturity Date				Dec. 23, 2042	Dec. 23, 2042
Debt Instrument, Interest Rate, Effective Percentage							5.05%	5.05%		5.05%	5.05%	5.05%
UNITED ARAB EMIRATES
Foreign Earnings Repatriated							$ 800
Land and Buildings in Lebanon, Tennessee [Member]
Lessee, Finance Lease, Term of Contract (Year)		15 years
Lessee, Finance Lease, Annual Rent Increase, Percentage		2.00%
Lessee, Finance Lease, Number of Options to Extend		4
Lessee, Finance Lease, Renewal Term (Year)		5 years
Lessee, Finance Lease, Discount Rate		8.00%
Finance Lease, Liability, Noncurrent							9,300	$ 9,300		$ 9,300	$ 9,300
Land and Buildings in Lebanon, Tennessee [Member]
Disposal Group, Including Discontinued Operation, Consideration		$ 10,400
Proceeds from Sale of Property, Plant, and Equipment, Total		9,100
Escrow Deposit		$ 400
Maximum [Member]
Foreign Earnings Repatriated								100
Revolving Lines, North America [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 18,000															$ 18,000
Line of Credit Facility, Covenant Terms, EBITDA Ratio, Term One																1.10
Repayments of Long-term Lines of Credit			$ 1,000
Line of Credit Facility, Additional Fees to Be Incurred			100
Line of Credit Facility, Maximum Borrowing Capacity, Availability Block			$ 2,000										2,500
Debt Instrument, Term (Year)	5 years
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage										0.25%
Line of Credit, Current													600
Line of Credit Facility, Current Borrowing Capacity													$ 8,500
Revolving Lines, North America [Member] | North American Loan Parties [Member]
Line of Credit Facility, Capital Expenditures Restrictions	$ 5,000
Line of Credit Facility, Common Stock Repurchase Restrictions	3,000
Line of Credit Facility, Fixed Charge Coverage Ratio Required											1.10
Line of Credit Facility, Covenant Terms, EBITDA Ratio, Minimum Undrawn Availability for Five Consecutive Days	3,000
Line of Credit Facility, Covenant Terms, EBITDA Ratio, Minimum Undrawn Availability	$ 2,000
Line of Credit Facility, Default, Additional Interest Rate	2.00%
Revolving Lines, North America [Member] | Base Rate [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Revolving Lines, North America [Member] | Base Rate [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Revolving Lines, North America [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Revolving Lines, North America [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Foreign Revolving Lines [Member]
Line of Credit Facility, Maximum Borrowing Capacity							14,900	14,900		$ 14,900	$ 14,900
Line of Credit Facility, Guaranteed Amount							100	100		100	100
Letters of Credit Outstanding, Amount							2,300	2,300		2,300	2,300
Proceeds from Issuance of Debt								6,100
Line of Credit Facility, Remaining Borrowing Capacity							6,500	6,500		6,500	6,500
Foreign Revolving Lines [Member] | Revolving Credit Lines Used by Middle Eastern Subsidiaries, 1 [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 2,200	$ 2,200		$ 2,200	$ 2,200	د.إ 8.0
Line of Credit Facility, Interest Rate at Period End							4.54%	4.54%		4.54%	4.54%	4.54%
Foreign Revolving Lines [Member] | Revolving Credit Lines Used by Middle Eastern Subsidiaries, 2 [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 4,800	$ 4,800		$ 4,800	$ 4,800	د.إ 17.5
Line of Credit Facility, Interest Rate at Period End							4.50%	4.50%		4.50%	4.50%	4.50%
Foreign Revolving Lines [Member] | Revolving Credit Lines Used by Middle Eastern Subsidiaries, 3 [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 800	$ 800		$ 800	$ 800	د.إ 3.0
Line of Credit Facility, Interest Rate at Period End							4.50%	4.50%		4.50%	4.50%	4.50%
Foreign Revolving Lines [Member] | Revolving Credit Lines Used by Egypt Subsidiaries [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 5,400	$ 5,400		$ 5,400	$ 5,400				ج.م. 100.0
Foreign Revolving Lines [Member] | Revolving Credit Lines Used by Egypt Subsidiaries 2 [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 1,500	$ 1,500		$ 1,500	$ 1,500			ج.م. 28.2
Line of Credit Facility, Interest Rate at Period End							8.00%	8.00%		8.00%	8.00%	8.00%
Foreign Revolving Lines [Member] | Minimum [Member]
Line of Credit Facility, Interest Rate at Period End							4.50%	4.50%		4.50%	4.50%	4.50%
Debt Instrument, Interest Rate, Stated Percentage							4.50%	4.50%		4.50%	4.50%	4.50%
Foreign Revolving Lines [Member] | Maximum [Member]
Line of Credit Facility, Interest Rate at Period End							8.00%	8.00%		8.00%	8.00%	8.00%
Foreign Revolving Lines [Member] | Weighted Average [Member]
Line of Credit Facility, Interest Rate at Period End							7.63%	7.63%		7.63%	7.63%	7.63%
Foreign Revolving Lines [Member] | EIBOR [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate								3.00%
Foreign Revolving Lines [Member] | EIBOR [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate								3.50%