CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net income	$ 6,476	$ 9,186
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization (including $303 and $304 associated with variable interest entity for the three months ended March 31, 2024 and 2023, respectively)	2,629	2,633
Adjustments to allowance for bad debt	(12)	(652)
Adjustments to inventory reserve	40	288
Write-off of inventory	293	216
Impairment of operating right-of-use asset	1,993	0
Loss, net, on disposal of machinery and equipment	1	82
Amortization of loan fees (including $15 and $16 associated with variable interest entity for the three months ended March 31, 2024 and 2023, respectively)	23	17
Accrued interest on certificates of deposit (including $38 and $0 associated with variable interest entity for the three months ended March 31, 2024 and 2023, respectively)	(126)	0
Stock-based compensation	375	277
Amortization of operating right-of-use assets	1,466	997
(Increase) decrease in operating assets
Accounts receivable (including $0 and $7 associated with variable interest entity for the three months ended March 31, 2024 and 2023, respectively)	(2,336)	(2,409)
Inventories	(8,077)	(207)
Prepaid expenses and other current assets (including $4 and $52 associated with variable interest entity for the three months ended March 31, 2024 and 2023, respectively)	1,727	1,023
Other non-current assets (including $14 and $88 associated with variable interest entity for the three months ended March 31, 2024 and 2023, respectively)	(190)	9
Increase (decrease) in operating liabilities
Accounts payable (including $5 and $1 associated with variable interest entity for the three months ended March 31, 2024 and 2023, respectively)	3,367	(1,978)
Accrued expenses (including $420 and $415 associated with variable interest entity for the three months ended March 31, 2024 and 2023, respectively)	742	(1,127)
Related party payable	(6)	4,967
Income taxes payable	0	1,782
Customer deposits (including $0 and $17 associated with variable interest entity for the three months ended March 31, 2024 and 2023, respectively)	(507)	(326)
Operating lease liabilities	(1,474)	(1,067)
Other non-current liabilities	155	474
Net cash provided by operating activities	6,559	14,185
Cash flows from investing activities
Purchases of property and equipment	(163)	(1,042)
Proceeds on disposal of property and equipment	23	25
Deposits paid for joint venture investment	0	(2,900)
Deposits refunded from joint venture investment	0	950
Deposits paid for property and equipment	(761)	(1,718)
Purchases of short-term investments (including $7,000 and $0 associated with variable interest entity for the three months ended March 31, 2024 and 2023, respectively)	(12,190)	(10,000)
Redemption of short-term investments	5,144	0
Net cash used in investing activities	(7,947)	(14,685)
Cash flows from financing activities
Proceeds from long-term debt (including $0 and $8,000 associated with variable interest entity for the three months ended March 31, 2024 and 2023, respectively)	0	8,000
Payments for lender fees	0	(61)
Payments on long-term debt (including $278 and $241 associated with variable interest entity for the three months ended March 31, 2024 and 2023, respectively)	(278)	(241)
Tax withholding on vesting of restricted stock units	0	(14)
Proceeds from exercise of common stock options	52	0
Dividends paid to shareholders	(5,992)	0
Payment for Global Wells noncontrolling membership interest redemption (including $2,010 and $0 associated with variable interest entity for the three months ended March 31, 2024 and 2023, respectively)	(2,326)	0
Net cash (used in) provided by financing activities	(8,544)	7,684
Net (decrease) increase in cash and cash equivalents	(9,932)	7,184
Cash and cash equivalents
Beginning of year	23,076	16,041
End of year	13,144	23,225
Supplemental disclosures of non-cash investing and financing activities:
Transfers from deposit to property and equipment	1,148	4,381
Non-cash purchases of property and equipment	159	1,159
Supplemental disclosures of cash flow information:
Income tax refund	13	0
Cash paid for interest	$ 502	$ 421