Note 3 - Retention (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2022	Jan. 31, 2024	Jan. 31, 2023	Dec. 31, 2015
Increase (Decrease) in Accounts Receivable		$ 4,859	$ 3,232
Accounts Receivable, Allowance for Credit Loss, Ending Balance		0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accounts Receivable, after Allowance for Credit Loss		2,200		$ 41,900
Increase (Decrease) in Accounts Receivable		39,700
Retention Receivable, Settlement Amount	$ (900)	(600)
Accounts Receivable, Allowance for Credit Loss, Ending Balance		0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other Noncurrent Assets [Member]
Accounts Receivable, after Allowance for Credit Loss, Noncurrent		1,400
Retention Receivable [Member]
Receivables, Long-Term Contracts or Programs		2,500	2,400
Receivables, Long-Term Contracts or Programs, Noncurrent		$ 1,700	$ 2,900