Note 2 - Summary of Significant Accounting Policies - Weighted Average Common Shares (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Weighted average common shares outstanding - basic (in shares)	12,189,761	11,886,005	12,150,240	11,294,306
Potentially dilutive securities:
Unvested shares of restricted stock and employee stock options (in shares)	61,951	326,312	96,523	371,544
Weighted average common shares and common share equivalents outstanding - diluted (in shares)	12,251,712	12,212,317	12,246,763	11,665,850
Average number of potentially dilutive securities excluded from calculation because their effect was anti-dilutive during the period (in shares)	734,574	107,666	589,478	119,585