Note 10 - Income Taxes (Tables)

12 Months Ended

Mar. 31, 2024

Notes Tables

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Year Ended March 31,
	2024		2023
Federal
Current	$	4,248	$	2,135
Deferred		473		3,425
		4,721		5,560
State
Current		927		1,384
Deferred		321		(99	)
		1,248		1,285
Total	$	5,969	$	6,845

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended March 31,
	2024			2023
Income tax expense at U.S. federal statutory rate		21.0	%		21.0	%
Current year state and local income taxes net of federal income tax benefit		4.3			3.5
Other		0.3			(0.3	)
Provision for income taxes		25.6	%		24.2	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	March 31,
	2024			2023
Deferred tax liabilities:
Depreciation	$	(6,451	)	$	(5,786	)
Total deferred tax liabilities		(6,451	)		(5,786	)
Deferred tax assets:
Unrealized derivative loss - OCI		—			106
Inventory capitalization		552			548
Postretirement benefits other than pensions		26			25
Restricted stock compensation		77			91
Unrealized loss - mark to market derivatives		403			526
Other		136			133
Total deferred tax assets		1,194			1,429
Net deferred tax liability	$	(5,257	)	$	(4,357	)