Note 4 - Revenue Disaggregation - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022		Mar. 31, 2021
Net Revenue	$ 4,655,727	[1]	$ 3,365,860
Transferred over Time [Member]
Net Revenue	2,602,000		1,745,000
Transferred at Point in Time [Member]
Net Revenue	2,054,000		1,621,000
Aerospace [Member]
Net Revenue	705,000		715,000
Aerospace [Member] | Transferred over Time [Member]
Net Revenue	0		189,000
Aerospace [Member] | Transferred at Point in Time [Member]
Net Revenue	705,000		526,000
Energy, Storage and Transmission [Member]
Net Revenue	906,000		0
Energy, Storage and Transmission [Member] | Transferred over Time [Member]
Net Revenue	899,000		0
Energy, Storage and Transmission [Member] | Transferred at Point in Time [Member]
Net Revenue	7,000		0
Industrial [Member]
Net Revenue	1,869,000		2,044,000
Industrial [Member] | Transferred over Time [Member]
Net Revenue	997,000		1,369,000
Industrial [Member] | Transferred at Point in Time [Member]
Net Revenue	872,000		675,000
Research [Member]
Net Revenue	1,176,000		607,000
Research [Member] | Transferred over Time [Member]
Net Revenue	706,000		187,000
Research [Member] | Transferred at Point in Time [Member]
Net Revenue	$ 470,000		$ 420,000

[1] All elimination entries represent intersegment revenues eliminated in consolidation for external financial reporting.