Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net Revenue	$ 16,920,219	$ 19,646,652
Transferred over Time [Member]
Net Revenue	6,664,000	9,032,000
Transferred at Point in Time [Member]
Net Revenue	10,256,000	10,615,000
Aerospace [Member]
Net Revenue	7,620,000	9,172,000
Aerospace [Member] | Transferred over Time [Member]
Net Revenue	1,607,000	3,224,000
Aerospace [Member] | Transferred at Point in Time [Member]
Net Revenue	6,013,000	5,948,000
Industrial [Member]
Net Revenue	5,414,000	7,193,000
Industrial [Member] | Transferred over Time [Member]
Net Revenue	1,849,000	3,199,000
Industrial [Member] | Transferred at Point in Time [Member]
Net Revenue	3,565,000	3,994,000
Research [Member]
Net Revenue	3,886,000	3,282,000
Research [Member] | Transferred over Time [Member]
Net Revenue	3,208,000	2,609,000
Research [Member] | Transferred at Point in Time [Member]
Net Revenue	$ 678,000	$ 673,000