Note 3 - Fair Value Measurement - Fair Value of Assets Measured on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Total cash and cash equivalents	$ 949	$ 1,103
Fair Value, Inputs, Level 1 [Member]
Total cash and cash equivalents	2	2
Fair Value, Inputs, Level 2 [Member]
Total cash and cash equivalents	0	0
Fair Value, Inputs, Level 3 [Member]
Total cash and cash equivalents	0	0
Money Market Funds [Member]
Total cash and cash equivalents	2	2
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Total cash and cash equivalents	2	2
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Total cash and cash equivalents	0	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Total cash and cash equivalents	0	0
Savings Account [Member]
Total cash and cash equivalents	580	1,072
Savings Account [Member] | Fair Value, Inputs, Level 1 [Member]
Total cash and cash equivalents	0	0
Savings Account [Member] | Fair Value, Inputs, Level 2 [Member]
Total cash and cash equivalents	0	0
Savings Account [Member] | Fair Value, Inputs, Level 3 [Member]
Total cash and cash equivalents	0	0
Demand Deposits [Member]
Total cash and cash equivalents	367	29
Demand Deposits [Member] | Fair Value, Inputs, Level 1 [Member]
Total cash and cash equivalents	0	0
Demand Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
Total cash and cash equivalents	0	0
Demand Deposits [Member] | Fair Value, Inputs, Level 3 [Member]
Total cash and cash equivalents	$ 0	$ 0