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Note 4 - Revenue Disaggregation - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net Revenue	$ 5,808,588	$ 4,034,408	$ 10,460,820	$ 7,400,268
Transferred over Time [Member]
Net Revenue	3,773,000	1,788,000	6,374,000	3,533,000
Transferred at Point in Time [Member]
Net Revenue	2,036,000	2,246,000	4,087,000	3,867,000
Aerospace [Member]
Net Revenue	520,000	774,000	1,221,000	1,488,000
Aerospace [Member] | Transferred over Time [Member]
Net Revenue	0	197,000	0	386,000
Aerospace [Member] | Transferred at Point in Time [Member]
Net Revenue	520,000	577,000	1,221,000	1,102,000
Energy, Storage and Transmission [Member]
Net Revenue	2,243,000	0	3,149,000	0
Energy, Storage and Transmission [Member] | Transferred over Time [Member]
Net Revenue	2,024,000	0	2,923,000	0
Energy, Storage and Transmission [Member] | Transferred at Point in Time [Member]
Net Revenue	219,000	0	226,000	0
Industrial [Member]
Net Revenue	2,175,000	2,519,000	4,043,000	4,564,000
Industrial [Member] | Transferred over Time [Member]
Net Revenue	1,450,000	1,226,000	2,446,000	2,595,000
Industrial [Member] | Transferred at Point in Time [Member]
Net Revenue	725,000	1,293,000	1,597,000	1,969,000
Research [Member]
Net Revenue	871,000	741,000	2,048,000	1,348,000
Research [Member] | Transferred over Time [Member]
Net Revenue	299,000	365,000	1,005,000	552,000
Research [Member] | Transferred at Point in Time [Member]
Net Revenue	$ 572,000	$ 376,000	$ 1,043,000	$ 796,000

X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
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-Section S99
-Paragraph 1
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-URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

+ Details

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