Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2025	Mar. 31, 2025
Current assets:
Cash and cash equivalents	$ 18,940	$ 24,516
Accounts receivable - net of related allowance for credit losses of $1 and $2, as of September 30, 2025 and March 31, 2025, respectively	142	109
Materials and supplies	1,176	968
Income taxes receivable	902	902
Prepaid expenses and other current assets	1,385	941
Assets of discontinued operations	12	0
Total current assets	22,557	27,436
Operating lease right-of-use assets	2,823	2,963
Property, plant, and equipment, net	39,677	30,945
Intangible assets, net	3,401	3,673
Goodwill	12,280	12,280
Other assets	330	375
Total assets	81,068	77,672
Current liabilities:
Accounts payable	3,070	1,300
Accrued expenses and other current liabilities	839	588
Operating lease liability - current portion	296	286
Contract liability	639	569
Current portion long-term debt	115	69
Liabilities of discontinued operations	0	90
Total current liabilities	4,959	2,902
Deferred income taxes	4,333	4,306
Long-term debt	3,348	759
Operating lease liability	2,538	2,685
Total liabilities	15,178	10,652
Commitments and contingencies (Note 10)
Redeemable non-controlling interest	12,113	13,880
Shareholders’ equity:
Preferred stock, no par value: 5,000 shares authorized; none issued	0	0
Common stock, 50,000 shares authorized, $0.01 par value, 12,716 shares issued and 6,755 outstanding at September 30, 2025; no par value, 12,674 shares issued and 6,696 shares outstanding at March 31, 2025	68	67
Treasury stock: 5,961 and 6,020 common shares, at cost, as of September 30, 2025 and March 31, 2025, respectively	(81,927)	(82,423)
Additional paid-in capital	43,285	41,645
Retained earnings	92,351	93,851
Total shareholders' equity	53,777	53,140
Total liabilities, redeemable non-controlling interest and shareholders' equity	$ 81,068	$ 77,672