Note 2 - Summary of Significant Accounting Policies - Weighted Average Common Shares (Details) - shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Weighted average common shares outstanding–basic (in shares)	12,026,361	10,755,729
Unvested shares of restricted stock and employee stock options (in shares)	131,936	332,935
Weighted average common shares and common share equivalents outstanding–diluted (in shares)	12,158,297	11,088,664
Average number of potentially dilutive securities excluded from calculation because their effect was anti-dilutive during the period (in shares)	434,584	154,429