Note 11 - Earnings Per Share - Calculation of Basic and Diluted Weighted Average Common Shares (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Basic weighted average common shares outstanding (in shares)	6,684,281	6,634,746	6,682,347	6,630,391
Dilutive effect of options and unvested restricted shares (in shares)	2,948	0	0	0
Diluted weighted average shares outstanding (in shares)	6,687,229	6,634,746	6,682,347	6,630,391