Note 8 - Leases - Lease Cost (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Operating leases, weighted-average remaining lease term (Year)		2 years	2 years 2 months 12 days
Operating leases, weighted-average discount rate		3.70%	4.60%
Operating cash flows from operating leases		$ 711	$ 909
Right-of-use assets obtained in exchange for lease obligations		481	1,419
Total lease expenses		1,111	1,003
Cost of Sales [Member]
Operating lease expenses	[1]	678	636
Operating Expense [Member]
Operating lease expenses	[1]	$ 433	$ 367

[1] Includes short-term lease expenses of approximately $103,000 and $126,000 for the twelve months ended December 31, 2020 and December 31, 2019, respectively.