Note 17 - Segment and Related Information (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Twelve Months Ended December 31, 2021
	Commercial Air Handling Equipment		Industrial And Transportation Products		Corporate and Other			Consolidated
Sales	$	38,018,412	$	66,143,815	$	-		$	104,162,227
Gross Profit	$	7,749,628	$	14,162,131	$	706		$	21,912,465
Operating Income	$	3,065,156	$	4,519,290	$	(594,194	)	$	6,990,252
Pretax Income	$	3,071,119	$	4,209,308	$	82,515		$	7,362,942
Net Income (Loss)	$	2,303,339	$	3,468,366	$	(118,407	)	$	5,653,298

	Twelve Months Ended December 31, 2020 (1)
	Commercial Air Handling Equipment		Industrial And Transportation Products		Corporate and Other		Consolidated
Sales	$	41,243,413	$	43,826,487	$	-	$	85,069,900
Gross Profit	$	10,216,587	$	8,714,703	$	-	$	18,931,290
Operating Income	$	5,313,487	$	2,008,958	$	130,008	$	7,452,453
Pretax Income	$	5,750,226	$	1,298,632	$	696,383	$	7,745,241
Net Income	$	4,312,669	$	1,004,430	$	522,288	$	5,839,387

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

	Year Ended December 31, 2021		Year Ended December 31, 2020
United States of America	$	102,678,670	$	83,992,635
Puerto Rico		619,625		601,232
Mexico		309,978		-
Canada		292,927		388,531
Other		261,027		87,502
	$	104,162,227	$	85,069,900