Note 13 - Segment and Related Information - Information by Industry Segment (Details) - USD ($)	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Sales	$ 21,836,087	$ 11,878,700
Gross profit	4,829,888	3,018,441
Operating income	2,571,071	643,085
Income (loss) before provision for income taxes	2,328,872	498,336
Operating Segments [Member] \| Commercial Air Handling [Member]
Sales	11,744,561	9,115,937
Gross profit	3,001,933	2,147,125
Operating income	1,782,987	880,106
Income (loss) before provision for income taxes	1,782,696	865,205
Operating Segments [Member] \| Test and Measurement [Member]
Sales	274,032	1,071,847
Gross profit	45,214	475,026
Operating income	45,214	(110,031)
Income (loss) before provision for income taxes	45,214	(128,949)
Operating Segments [Member] \| Industrial Hose [Member]
Sales	1,797,091	1,690,916
Gross profit	525,735	396,290
Operating income	248,291	140,012
Income (loss) before provision for income taxes	192,479	100,189
Operating Segments [Member] \| Aerospace [Member]
Sales	8,020,403
Gross profit	1,257,006
Operating income	759,609
Income (loss) before provision for income taxes	562,956
Corporate, Non-Segment [Member]
Operating income	(265,030)	(267,002)
Income (loss) before provision for income taxes	(254,473)	(338,109)
Consolidation, Eliminations [Member]
Income (loss) before provision for income taxes

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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