Note 1 - Nature of Operations (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Apr. 10, 2020 USD ($)
Number of Operating Segments	2
Net Income (Loss) Attributable to Parent, Total	$ (1,143)	$ 1,138
Revenue from Contract with Customer, Including Assessed Tax	11,230	18,062
Subsequent Event [Member] | 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	$ 5,011	$ 10,111