Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 4,969	$ 3,360
Reconciliation of Net Income to Net Cash Provided by Operating Activities:
Depreciation	129	155
Deferred tax (income) expense	(80)	179
Loss on disposal of assets for lease	78	74
Allowance for credit losses	48	21
Change in fair values of notes held for investment	107
Gain on short-term investments	(305)
Stock-based compensation	702	628
Changes in Operating Assets and Liabilities:
Trade accounts receivable	(5,507)	(1,818)
Inventory	(43)	(45)
Prepaid expenses and other current assets	(1,301)	(1,988)
Other non-current assets	25	19
Accounts payable	(537)	(68)
Accrued expenses	2,458	946
Other current and non-current liabilities	118	39
Net Cash Provided by Operating Activities	861	1,502
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property and equipment	(95)	(122)
Proceeds from maturities of short-term investments	20,211
Purchase of short-term investments	(37,496)
Purchase of notes held for investment	(500)
Purchase of assets for lease	(544)	(134)
Net Cash Used in Investing Activities	(18,424)	(256)
CASH FLOWS FROM FINANCING ACTIVITIES:
Taxes paid related to net settlement of equity awards	(146)	(106)
Treasury stock acquired		(99)
Proceeds from exercise of stock options		62
Net Cash Used in Financing Activities	(146)	(143)
(DECREASE) INCREASE IN CASH	(17,709)	1,103
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	23,014	37,323
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 5,305	$ 38,426