Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue	$ 8,577	$ 7,087
UNITED STATES
Revenue	695	767
Non-US [Member]
Revenue	7,882	6,320
Instruments and Accessories [Member]
Revenue	1,874	1,776
Instruments and Accessories [Member] | UNITED STATES
Revenue	205	211
Instruments and Accessories [Member] | Non-US [Member]
Revenue	1,669	1,565
Service [Member]
Revenue	1,052	1,373
Service [Member] | UNITED STATES
Revenue	294	300
Service [Member] | Non-US [Member]
Revenue	758	1,073
Lease [Member]
Revenue	2,006	1,387
Lease [Member] | UNITED STATES
Revenue	196	256
Lease [Member] | Non-US [Member]
Revenue	1,810	1,131
Systems [Member]
Revenue	3,645	2,551
Systems [Member] | Non-US [Member]
Revenue	$ 3,645	$ 2,551