Note 4 - Revenue Disaggregation - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net Revenue	$ 8,118,627	$ 4,329,459	$ 18,579,447	$ 11,729,727
Transferred over Time [Member]
Net Revenue	6,271,000	2,163,000	12,645,000	5,697,000
Transferred at Point in Time [Member]
Net Revenue	1,848,000	2,167,000	5,934,000	6,033,000
Aerospace [Member]
Net Revenue	154,000	574,000	1,375,000	2,063,000
Aerospace [Member] | Transferred over Time [Member]
Net Revenue	0	0	0	386,000
Aerospace [Member] | Transferred at Point in Time [Member]
Net Revenue	154,000	574,000	1,375,000	1,677,000
Energy, Storage and Transmission [Member]
Net Revenue	3,816,000	0	6,763,000	0
Energy, Storage and Transmission [Member] | Transferred over Time [Member]
Net Revenue	3,791,000	0	6,714,000	0
Energy, Storage and Transmission [Member] | Transferred at Point in Time [Member]
Net Revenue	25,000	0	49,000	0
Industrial [Member]
Net Revenue	2,806,000	2,756,000	7,296,000	7,320,000
Industrial [Member] | Transferred over Time [Member]
Net Revenue	1,653,000	1,551,000	4,099,000	4,147,000
Industrial [Member] | Transferred at Point in Time [Member]
Net Revenue	1,153,000	1,205,000	3,197,000	3,173,000
Research [Member]
Net Revenue	1,343,000	1,000,000	3,145,000	2,347,000
Research [Member] | Transferred over Time [Member]
Net Revenue	827,000	612,000	1,832,000	1,164,000
Research [Member] | Transferred at Point in Time [Member]
Net Revenue	$ 516,000	$ 388,000	$ 1,313,000	$ 1,183,000