Note 2 - Summary of Significant Accounting Policies - Weighted Average Common Shares (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Weighted average common shares outstanding - basic (in shares)	12,234,599	11,241,183	12,130,480	10,998,456
Unvested shares of restricted stock and employee stock options (in shares)	95,681	455,386	113,809	394,161
Weighted average common shares and common share equivalents outstanding - diluted (in shares)	12,330,280	11,696,569	12,244,289	11,392,617
Average number of potentially dilutive securities excluded from calculation because their effect was anti-dilutive during the period (in shares)	599,276	96,661	516,930	125,545