Note 10 - Stock Options and Stock Purchase Warrants - Fair Value Assumption Measurement of the Stock Options (Details)	12 Months Ended
	Dec. 31, 2021 $ / shares
Weighted average fair value at the measurement date ($) (in dollars per share)	$ 3.1
Dividend yield (%)	0.00%
Expected volatility of the share prices (%)	68.90%
Risk-free interest rate (%)	1.30%
Weighted average share price ($) (in dollars per share)	$ 5.4
Minimum [Member]
Expected life of share options (years) (Year)	4 years
Maximum [Member]
Expected life of share options (years) (Year)	6 years 3 months 18 days