Note 1 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Sep. 30, 2022

Notes Tables

Financing Receivable, Allowance for Credit Loss [Table Text Block]

Year Ended	Balance at Beginning of Year		Additions (Recoveries) Charged to Costs and Expenses			Less Write-offs		Balance at End of Year
September 30, 2022	$	79,000	$	-		$	-	$	79,000
September 30, 2021	$	289,000	$	(210,000	)	$	-	$	79,000

Schedule of Inventory, Current [Table Text Block]

	September 30, 2022			September 30, 2021
In thousands
Raw materials	$	66,440		$	23,072
Work-in-process		7,294			2,482
Finished goods		10,803			3,361
Inventories, gross		84,537			28,915
Inventory reserve		(2,329	)		(1,391	)
Inventories, net	$	82,208		$	27,524

Property, Plant and Equipment [Table Text Block]

(In thousands)	September 30, 2022		September 30, 2021
Manufacturing equipment	$	18,418	$	9,179
Office equipment		4,174		2,901
Leasehold improvements		5,000		2,590
Vehicles		340		246
Construction in progress		1,715		150
Property, plant and equipment, gross		29,647		15,066
Less accumulated depreciation		11,418		10,068
Property, plant and equipment, net	$	18,229	$	4,998

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	September 30, 2022
(In thousands)	Years		Gross Carrying Amount		Accumulated Amortization		Net Book Value Amount
Customer relationships		15	$	4,833	$	1,273	$	3,559
Certifications		8		584		133		451
Trademarks		8-10		1,306		586		720
Patents		20		931		118		813
Developed Technology		10		295		5		290
Other		5		6		6		-
Software		1-3		2,452		1,909		543
Totals			$	10,407	$	4,030	$	6,376

	September 30, 2021
(In thousands)	Years		Gross Carrying Amount		Accumulated Amortization		Net Book Value Amount
Customer relationships		15	$	3,742	$	904	$	2,838
Certifications		8		1,068		484		584
Trademarks		8		563		255		308
Patents		20		790		85		706
Other		5		31		25		6
Software		1-3		1,960		1,705		255
Totals			$	8,154	$	3,458	$	4,696

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

(In thousands)	Estimated amortization expense
FY 2023	$	865
FY 2024		786
FY 2025		685
FY 2026		470
FY 2027		394
Total	$	3,200

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

Year ended September 30, (In thousands except share data)	2022		2021		2020
Net income	$	49,362	$	20,327	$	7,293
Weighted average common shares		13,771,665		13,720,699		13,643,355
Dilutive potential common shares		134,319		63,593		-
Weighted average dilutive common shares outstanding		13,905,984		13,784,294		13,643,355
Earnings per share:
Basic		3.58	$	1.48	$	0.53
Diluted		3.55	$	1.47	$	0.53

Useful Lives [Member]

Notes Tables

Property, Plant and Equipment [Table Text Block]

	Years
Equipment	3 – 15
Leasehold improvements	7-10 or life of lease
Vehicles	3