CONSOLIDATED BALANCE SHEETS - (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Accounts receivable, allowance for doubtful accounts	$ 872	$ 817
Shareholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	99,000,000	99,000,000
Common stock, shares issued (in shares)	2,742,857	2,742,857
Common stock, shares outstanding (in shares)	2,063,280	2,071,081
Treasury stock, shares (in shares)	679,577	671,776