Note 2 - Business Combinations (Details Textual) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Aug. 29, 2025	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2025
Payments to Acquire Businesses, Gross			$ 45,597	$ (0)
Business Combination, Contingent Consideration, Liability, Noncurrent		$ 3,580	3,580		$ 0
Selling, General and Administrative Expenses [Member]
Payments to Acquire Businesses, Net of Cash Acquired		$ 900	$ 1,100
Century Metals and Supplies [Member]
Business Combination, Consideration Transferred	$ 52,700
Payments to Acquire Businesses, Gross	45,600
Business Combination, Consideration Transferred, Liabilities Incurred	3,500
Business Combination, Consideration Transferred, Earn-out Provisions	3,600
Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount	$ 10,000
Business Combination, Contingent Consideration, Term (Year)	4 years
Business Combination, Contingent Consideration, Liability, Noncurrent	$ 3,500