Note 4 - Acquisition - Unaudited Pro Forma Financial Information (Details) - Honeywell International, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021		Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net sales	$ 125,507		$ 133,104	$ 383,454	$ 317,898
Net income	$ 2,517	[1]	$ 14,153	$ 22,620	$ 19,734
Diluted earnings per share (in dollars per share)	$ 0.34		$ 1.93	$ 3.04	$ 2.68

[1] The Acquisition-related costs mentioned above are excluded from the unaudited pro forma net income.