CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Cash flows from operating activities
Net income	$ 32,664	$ 30,824
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization (including $1,214 and $1,213 associated with variable interest entity for the year ended December 31, 2025 and 2024, respectively)	10,891	10,675
Adjustments to allowance for bad debt	168	468
Adjustments to inventory reserve	70	290
Write-off of inventories	917	1,458
Impairment of operating right-of-use asset	0	1,993
(Gain) loss, net, on disposal of property and equipment	(493)	759
Amortization of loan fees (including $62 associated with variable interest entity for both the year ended December 31, 2025 and 2024)	125	92
Accrued interest on certificates of deposit (including $0 and $50 associated with variable interest entity for the year ended December 31, 2025 and 2024, respectively)	0	(50)
Stock-based compensation	1,182	2,065
Amortization of operating right-of-use assets	10,227	7,622
Deferred income taxes	2,255	(3,771)
Government grant income (including $33 and $187 associated with variable interest entity for the year ended December 31, 2025 and 2024, respectively)	(70)	(360)
(Increase) decrease in operating assets
Accounts receivable (including $4 and $32 associated with variable interest entity for the year ended December 31, 2025 and 2024, respectively)	(9,834)	559
Inventories	(11,947)	(942)
Prepaid expenses and other current assets (including $255 and $23 associated with variable interest entity for the year ended December 31, 2025 and 2024, respectively)	(1,343)	2,776
Other non-current assets (including $35 and $20 associated with variable interest entity for the year ended December 31, 2025 and 2024, respectively)	15	(79)
Increase (decrease) in operating liabilities
Accounts payable (including $53 and $47 associated with variable interest entity for the year ended December 31, 2025 and 2024, respectively)	7,791	(260)
Accrued expenses (including $46 and $102 associated with variable interest entity for the year ended December 31, 2025 and 2024, respectively)	(95)	2,979
Related party payable	1,542	(2,176)
Income taxes payable (including $0 and 3 associated with variable interest entity for the year ended December 31, 2025 and 2024, respectively)	(65)	65
Deferred revenue	(29)	(281)
Operating lease liabilities	(10,254)	(6,679)
Other liabilities (including $66 and $0 associated with variable interest entity for the year ended December 31, 2025 and 2024, respectively)	98	(45)
Net cash provided by operating activities	33,815	47,982
Cash flows from investing activities
Purchases of property and equipment	(756)	(934)
Proceeds from disposal of property and equipment	1,509	134
Deposits paid for property and equipment	(3,749)	(3,134)
Purchases of publicly-traded equity securities	(451)	29
Proceeds from disposal of publicly-traded equity securities	503	0
Purchases of short-term investments (including $7,982 and $18,078 associated with variable interest entity for the year ended December 31, 2025 and 2024, respectively)	(16,300)	(50,806)
Redemption of short-term investments (including $19,110 and $7,000 associated with variable interest entity for the year ended December 31, 2025 and 2024, respectively)	44,643	48,856
Net cash provided by (used in) investing activities	25,399	(5,855)
Cash flows from financing activities
Payments on long-term debt (including $12,717 and $1,122 associated with variable interest entity for the year ended December 31, 2025 and 2024, respectively)	(12,717)	(1,122)
Payments for lender fees	(147)	0
Proceeds from line of credit	4,500	0
Repayments on line of credit	(4,500)	0
Proceeds from exercise of common stock options	300	725
Repurchases of common stock	(2,998)	0
Dividends paid to shareholders	(36,100)	(31,016)
Payment of Global Wells membership interest tax withholding (including $362 and $0 associated with variable interest entity for the year ended December 31, 2025 and 2024, respectively)	(377)	0
Payment of Global Wells noncontrolling membership interest redemption (including $0 and $2,010 associated with variable interest entity for the year ended December 31, 2025 and 2024, respectively)	0	(2,326)
Refund of Global Wells members' tax withholding payments (including $0 and $120 associated with variable interest entity for the year ended December 31, 2025 and 2024, respectively)	0	120
Payment of Global Wells noncontrolling membership interest redemption gain tax withholding	(879)	0
Net cash used in financing activities	(52,918)	(33,619)
Net increase in cash and cash equivalents	6,296	8,508
Cash and cash equivalents
Beginning of period	31,584	23,076
End of period	37,880	31,584
Supplemental disclosures of non-cash investing and financing activities:
Transfers from deposits to property and equipment	3,785	3,708
Non-cash purchases of property and equipment	962	122
Non-cash disposal of property and equipment	480	0
Non-cash excise tax on share repurchases	12	0
Supplemental disclosures of cash flow information:
Cash paid for income taxes	9,136	10,969
Cash paid for interest	$ 1,910	$ 2,031