Shareholders' Equity - Shareholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			$ 74,130
Foreign currency translation adjustment	$ (1)	$ (12)	4	$ (23)
Net loss	(1,019)	(257)	(1,851)	(2,224)
Balance, end of period	43,366	51,323	43,366	51,323
Common stock and additional paid-in capital [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	74,957	74,855	74,934	72,818
Dividends paid	(28,979)	0	(28,979)	0
Issuance of common stock and warrants, net	0	0	0	2,000
Share-based compensation expense	25	30	47	65
Proceeds from employee stock purchase plan	0	0	1	2
Balance, end of period	46,003	74,885	46,003	74,885
Accumulated other comprehensive loss [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(283)	(280)	(288)	(241)
Unrealized loss on available-for-sale securities, net of tax	14	26	14	(2)
Foreign currency translation adjustment	(1)	(12)	4	(23)
Balance, end of period	(270)	(266)	(270)	(266)
Accumulated deficit [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(1,348)	(23,039)	(516)	(21,072)
Net loss	(1,019)	(257)	(1,851)	(2,224)
Balance, end of period	$ (2,367)	$ (23,296)	$ (2,367)	$ (23,296)