Note 4 - Revenue Disaggregation - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net Revenue	$ 6,036,360	$ 3,468,675
Transferred over Time [Member]
Net Revenue	3,394,000	2,629,000
Transferred at Point in Time [Member]
Net Revenue	2,642,000	840,000
Aerospace [Member]
Net Revenue	3,483,000	992,000
Aerospace [Member] | Transferred over Time [Member]
Net Revenue	1,187,000	247,000
Aerospace [Member] | Transferred at Point in Time [Member]
Net Revenue	2,296,000	745,000
Industrial [Member]
Net Revenue	782,000	1,433,000
Industrial [Member] | Transferred over Time [Member]
Net Revenue	520,000	1,365,000
Industrial [Member] | Transferred at Point in Time [Member]
Net Revenue	262,000	68,000
Research [Member]
Net Revenue	1,771,000	1,044,000
Research [Member] | Transferred over Time [Member]
Net Revenue	1,687,000	1,017,000
Research [Member] | Transferred at Point in Time [Member]
Net Revenue	$ 84,000	$ 27,000