Note 5 - Share-based Compensation - Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member]	6 Months Ended
	Jun. 30, 2023 $ / shares shares
Outstanding, Balance, RSU (in shares) | shares	0
Outstanding, Weighted-average Grant Date Fair Value (in dollars per share) | $ / shares	$ 0
Granted, RSU (in shares) | shares	411,005	[1]
Granted, Weighted-average Grant Date Fair Value (in dollars per share) | $ / shares	$ 1.38	[1]
Vested, RSU (in shares) | shares	(247,961)	[1]
Vested, Weighted-average Grant Date Fair Value (in dollars per share) | $ / shares	$ 1.38	[1]
Outstanding, Balance, RSU (in shares) | shares	163,044
Outstanding, Weighted-average Grant Date Fair Value (in dollars per share) | $ / shares	$ 1.38

[1] Represents the following restricted stock unit granted: •On January 3, 2023, the Company granted 247,961 RSUs fully vested, to executives and key personnel in lieu of cash bonus earned for the year ended 2022. The Company also granted 163,044 RSUs, vesting upon one year anniversary of the grant, to the Board of Directors as a result of reduction in director cash compensation for 2023. The grant of these RSUs was approved by the Compensation Committee of the Board of Directors in November 2022. The fair value of the common stock is the Company's closing stock price as reported on the Nasdaq Stock Exchange.