NOTE 6 - EARNINGS PER SHARE - Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings per Share
Net income	$ 17,982	$ 11,228
Basic EPS	$ 1.14	$ 0.71
Diluted EPS	$ 1.12	$ 0.70
Weighted average common shares outstanding (in shares)	15,803,643	15,796,796
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan (in shares)	221,905	214,660
Weighted average common and common equivalent shares outstanding (in shares)	16,025,548	16,011,456