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Note 4 - Revenue Disaggregation - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net Revenue	$ 4,329,459	$ 3,993,204	$ 11,729,727	$ 13,748,448
Transferred over Time [Member]
Net Revenue	2,163,000	1,085,000	5,697,000	3,859,000
Transferred at Point in Time [Member]
Net Revenue	2,167,000	2,908,000	6,033,000	9,889,000
Aerospace [Member]
Net Revenue	574,000	1,433,000	2,063,000	6,616,000
Aerospace [Member] | Transferred over Time [Member]
Net Revenue	0	181,000	386,000	1,480,000
Aerospace [Member] | Transferred at Point in Time [Member]
Net Revenue	574,000	1,252,000	1,677,000	5,136,000
Industrial [Member]
Net Revenue	2,756,000	1,668,000	7,320,000	3,538,000
Industrial [Member] | Transferred over Time [Member]
Net Revenue	1,551,000	322,000	4,147,000	708,000
Industrial [Member] | Transferred at Point in Time [Member]
Net Revenue	1,205,000	1,346,000	3,173,000	2,830,000
Research [Member]
Net Revenue	1,000,000	892,000	2,347,000	3,594,000
Research [Member] | Transferred over Time [Member]
Net Revenue	612,000	582,000	1,164,000	1,671,000
Research [Member] | Transferred at Point in Time [Member]
Net Revenue	$ 388,000	$ 310,000	$ 1,183,000	$ 1,923,000

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.

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