| Schedule of Segment Reporting Information, by Segment [Table Text Block] |
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Three Months Ended |
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Six Months Ended |
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June 30, |
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June 30, |
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2025 |
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|
2024 |
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2025 |
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|
2024 |
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| Sales summary by segment |
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| Commercial Air Handling |
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$ |
22,111,930 |
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|
$ |
16,431,398 |
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|
$ |
43,189,404 |
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|
$ |
33,409,842 |
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| Industrial and Transportation Products |
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|
24,742,532 |
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|
|
21,204,690 |
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|
|
46,979,169 |
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|
|
42,665,885 |
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| Total Sales |
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$ |
46,854,462 |
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|
$ |
37,636,088 |
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|
$ |
90,168,573 |
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|
$ |
76,075,727 |
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| Gross profit summary by segment |
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| Commercial Air Handling |
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$ |
8,453,630 |
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$ |
5,701,513 |
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$ |
15,577,698 |
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|
$ |
11,333,608 |
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| Industrial and Transportation Products |
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6,068,098 |
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4,709,802 |
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|
11,005,655 |
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9,322,740 |
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| Total Gross Profit |
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$ |
14,521,728 |
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$ |
10,411,315 |
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$ |
26,583,353 |
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$ |
20,656,348 |
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| Segment operating profit |
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| Commercial Air Handling |
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$ |
6,339,220 |
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$ |
4,672,034 |
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$ |
11,262,531 |
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|
$ |
9,220,835 |
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| Industrial and Transportation Products |
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2,460,729 |
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|
1,592,294 |
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|
3,892,806 |
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3,167,408 |
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| Total Segment Operating Profit |
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$ |
8,799,949 |
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$ |
6,264,328 |
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$ |
15,155,337 |
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$ |
12,388,243 |
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| Corporate charges not allocated to segments |
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$ |
1,469,494 |
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$ |
1,148,147 |
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$ |
2,932,028 |
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|
$ |
2,697,972 |
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| Operating Income |
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$ |
7,330,455 |
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$ |
5,116,181 |
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$ |
12,223,309 |
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$ |
9,690,271 |
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|
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|
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| Interest charges |
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$ |
308,916 |
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|
$ |
304,057 |
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$ |
635,540 |
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|
$ |
541,898 |
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| Loss on investments |
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- |
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|
261,389 |
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|
- |
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|
379,466 |
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| Other (income) expense, net |
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|
69,307 |
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|
(5,557 |
) |
|
|
420,962 |
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|
|
66,706 |
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| Income before Provision for Income Taxes |
|
$ |
6,952,232 |
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|
$ |
4,556,292 |
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|
$ |
11,166,807 |
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|
$ |
8,702,201 |
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