Note 1 - Nature of Operations (Details Textual) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Apr. 10, 2020 USD ($)
Number of Operating Segments					2
Net Income (Loss) Attributable to Parent, Total	$ 170	$ (1,143)	$ (187)	$ 1,138	$ (973)	$ 951
Revenue from Contract with Customer, Including Assessed Tax	13,275		14,352		24,505	32,414
M&T [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 7,500
Semiconductor Market [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 6,858		$ 7,641		$ 11,869	$ 17,752