Note 5 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,954	$ 2,131	$ 4,104	$ 2,744
Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	2,935	2,131	3,878	2,744
Rentals [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 19	$ 0	226	0
Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Revenue from Contract with Customer, Excluding Assessed Tax			$ 4,104	$ 2,744
Concentration Risk, Percentage			100.00%	100.00%
Product Concentration Risk [Member] \| Revenue Benchmark [Member]
Revenue from Contract with Customer, Excluding Assessed Tax			$ 4,104	$ 2,744
Concentration Risk, Percentage			100.00%	100.00%
Product Concentration Risk [Member] \| Revenue Benchmark [Member] \| Product [Member]
Revenue from Contract with Customer, Excluding Assessed Tax			$ 3,878	$ 2,744
Concentration Risk, Percentage			94.00%	100.00%
Product Concentration Risk [Member] \| Revenue Benchmark [Member] \| Rentals [Member]
Revenue from Contract with Customer, Excluding Assessed Tax			$ 226	$ 0
Concentration Risk, Percentage			6.00%	0.00%
UNITED STATES \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Revenue from Contract with Customer, Excluding Assessed Tax			$ 3,925	$ 2,383
Concentration Risk, Percentage			96.00%	87.00%
Europe [Member] \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Revenue from Contract with Customer, Excluding Assessed Tax			$ 0	$ 361
Concentration Risk, Percentage			0.00%	13.00%
Other Foreign Countries [Member] \| Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Revenue from Contract with Customer, Excluding Assessed Tax			$ 179	$ 0
Concentration Risk, Percentage			4.00%	0.00%