Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Accounts receivable, allowance for doubtful account		$ 3,760	$ 2,236
Common stock, par value (in dollars per share)		$ 0.001	$ 0.001
Common stock, shares authorized (in shares)		20,000,000	20,000,000
Common stock, shares issued (in shares)	[1]	7,174,506	7,075,506
Common stock, shares outstanding (in shares)	[1]	7,174,506	7,075,506

[1] Retrospectively restated for effect of the 1-for-5 reverse stock split on January 18, 2023, see Note 4(l).