Note 6 - Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred revenue	$ 141	$ 123
Accrued travel and entertainment expenses	129	118
Accrued product warranty costs	109	187
Accrued clinical trial costs	106	153
Accrued professional fees	60	0
Accrued sales and use tax	40	33
Other accrued liabilities	72	104
Total accrued expenses and other current liabilities	$ 657	$ 718