Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025
Current assets:
Cash and cash equivalents	$ 22,034	$ 24,516
Accounts receivable - net of related allowance for credit losses of $1 and $2, as of June 30, 2025 and March 31, 2025, respectively	146	109
Materials and supplies	1,005	968
Income taxes receivable	902	902
Prepaid expenses and other assets	1,258	941
Assets of discontinued operations	14	0
Total current assets	25,359	27,436
Operating lease right-of-use assets	2,894	2,963
Property, plant, and equipment, net	34,494	30,945
Intangible assets, net	3,546	3,673
Goodwill	12,280	12,280
Other assets	352	375
Total assets	78,925	77,672
Current liabilities:
Accounts payable	2,337	1,300
Accrued expenses and other current liabilities	699	588
Operating lease liability - current portion	291	286
Contract liability	612	569
Current portion long-term debt	57	69
Liabilities of discontinued operations	0	90
Total current liabilities	3,996	2,902
Deferred income taxes	4,326	4,306
Long-term debt	1,618	759
Operating lease liabilities	2,612	2,685
Total liabilities	12,552	10,652
Commitments and contingencies (Note 10)
Redeemable non-controlling interest	13,908	13,880
Shareholders’ equity:
Preferred stock, no par: 5,000 shares authorized; none issued	0	0
Common stock, 50,000 shares authorized, $0.01 par value, 12,716 shares issued and 6,708 outstanding at June 30, 2025; no par value, 12,674 shares issued and 6,696 shares outstanding at March 31, 2025	67	67
Treasury stock: 6,008 and 6,020 common shares, at cost, as of June 30, 2025 and March 31, 2025, respectively	(82,321)	(82,423)
Additional paid-in capital	41,616	41,645
Retained earnings	93,103	93,851
Total shareholders' equity	52,465	53,140
Total liabilities, redeemable non-controlling interest and shareholders' equity	$ 78,925	$ 77,672