CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities
Net income	$ 30,824	$ 33,180
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization (including $1,213 and $1,214 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	10,675	10,783
Adjustments to allowance for bad debt	468	(711)
Adjustments to inventory reserve	290	(399)
Write-off of inventories	1,458	3,897
Impairment of deposits	0	549
Write-off of vendor prepayment	0	1,124
Impairment of operating right-of-use asset	1,993	0
Loss, net, on disposal of machinery and equipment	759	2,002
Amortization of loan fees (including $62 and $57 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	92	81
Accrued interest on certificates of deposit (including $50 and $0 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	(50)	(155)
Stock-based compensation	2,065	770
Amortization of operating right-of-use assets	7,622	4,969
Deferred income taxes	(3,771)	(959)
Government grant income (including $187 and $0 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	(360)	0
(Increase) decrease in operating assets
Accounts receivable (including $32 and $6 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	559	2,860
Inventories	(942)	(3,820)
Prepaid expenses and other current assets (including $23 and $109 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	2,776	(466)
Other non-current assets (including $20 and $14 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	(79)	1,439
Increase (decrease) in operating liabilities
Accounts payable (including $47 and $60 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	(260)	696
Accrued expenses (including $102 and $34 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	2,979	1,571
Related party payable	(2,176)	366
Income taxes payable (including $3 and $0 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	65	0
Deferred revenue (including $0 and $49 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	(281)	(330)
Operating lease liabilities	(6,679)	(4,642)
Other liabilities	(45)	574
Net cash provided by operating activities	47,982	53,379
Cash flows from investing activities
Purchases of property and equipment	(934)	(2,835)
Proceeds from disposal of property and equipment	134	841
Payments for costs incurred from sale of machinery and equipment	0	(186)
Deposits paid for joint venture investment	0	(2,900)
Deposits refunded from joint venture investment	0	6,900
Deposits refunded from cancelled machinery orders	0	503
Deposits paid for property and equipment	(3,134)	(6,309)
Purchases of publicly-traded equity securities	29	0
Purchases of short-term investments (including $18,078 and $8,000 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	(50,806)	(49,188)
Redemption of short-term investments (including $7,000 and $8,000 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	48,856	23,000
Net cash used in investing activities	(5,855)	(30,174)
Cash flows from financing activities
Proceeds from long-term debt (including $0 and 8,000 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	0	8,000
Payments for lender fees	0	(61)
Payments on long-term debt (including $1,122 and $1,010 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	(1,122)	(1,010)
Tax withholding on vesting of restricted stock units	0	(18)
Proceeds from exercise of common stock options	725	123
Dividends paid to shareholders	(31,016)	(20,909)
Distributions to shareholders, net of tax withholding (including $0 and $2,295 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	0	(2,295)
Payment for Global Wells noncontrolling membership interest redemption (including $2,010 and $0 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	(2,326)	0
Refund of Global Wells members' tax withholding payments (including $120 and $0 associated with variable interest entity for the year ended December 31, 2024 and 2023, respectively)	120	0
Net cash used in financing activities	(33,619)	(16,170)
Net increase in cash and cash equivalents	8,508	7,035
Cash and cash equivalents
Beginning of period	23,076	16,041
End of period	31,584	23,076
Supplemental disclosures of non-cash investing and financing activities:
Transfers from deposits to property and equipment	3,708	10,463
Non-cash purchases of property and equipment	122	148
Supplemental disclosures of cash flow information:
Cash paid for income taxes	10,969	11,765
Cash paid for interest	$ 2,031	$ 1,996