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Note 4 - Revenue Disaggregation - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net Revenue	$ 3,365,860	$ 6,036,360
Transferred over Time [Member]
Net Revenue	1,745,000	1,886,000
Transferred at Point in Time [Member]
Net Revenue	1,621,000	4,150,000
Aerospace [Member]
Net Revenue	715,000	3,350,000
Aerospace [Member] | Transferred over Time [Member]
Net Revenue	189,000	1,165,000
Aerospace [Member] | Transferred at Point in Time [Member]
Net Revenue	526,000	2,185,000
Industrial [Member]
Net Revenue	2,044,000	988,000
Industrial [Member] | Transferred over Time [Member]
Net Revenue	1,369,000	127,000
Industrial [Member] | Transferred at Point in Time [Member]
Net Revenue	675,000	861,000
Research [Member]
Net Revenue	607,000	1,698,000
Research [Member] | Transferred over Time [Member]
Net Revenue	187,000	594,000
Research [Member] | Transferred at Point in Time [Member]
Net Revenue	$ 420,000	$ 1,104,000

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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