Note 15 - Weighted Average Shares Outstanding and Net Loss Per Share (Details Textual) - shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Nov. 30, 2019
The 2.75% Convertible Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage		2.75%	2.75%	2.75%
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	583,000	534,000
Convertible Debt Securities [Member] | The 2.75% Convertible Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	7,309,000	7,309,000