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Note 4 - Revenue Disaggregation - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net Revenue	$ 3,993,204	$ 5,704,882	$ 13,748,448	$ 14,100,261
Transferred over Time [Member]
Net Revenue	969,000	2,049,000	4,809,000	5,306,000
Transferred at Point in Time [Member]
Net Revenue	3,024,000	3,656,000	8,939,000	8,794,000
Aerospace [Member]
Net Revenue	1,433,000	2,506,000	6,748,000	4,409,000
Aerospace [Member] | Transferred over Time [Member]
Net Revenue	181,000	1,080,000	1,502,000	1,880,000
Aerospace [Member] | Transferred at Point in Time [Member]
Net Revenue	1,252,000	1,426,000	5,246,000	2,529,000
Industrial [Member]
Net Revenue	1,668,000	1,863,000	3,333,000	5,730,000
Industrial [Member] | Transferred over Time [Member]
Net Revenue	217,000	476,000	741,000	1,741,000
Industrial [Member] | Transferred at Point in Time [Member]
Net Revenue	1,451,000	1,387,000	2,592,000	3,989,000
Research [Member]
Net Revenue	892,000	1,336,000	3,667,000	3,961,000
Research [Member] | Transferred over Time [Member]
Net Revenue	571,000	493,000	2,566,000	1,685,000
Research [Member] | Transferred at Point in Time [Member]
Net Revenue	$ 321,000	$ 843,000	$ 1,101,000	$ 2,276,000

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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