Note 7 - Intangible Assets, Net (Details Textual) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended			12 Months Ended
	Jun. 30, 2020		Jun. 30, 2019	Mar. 31, 2018	Jun. 30, 2020		Jun. 30, 2019	Dec. 31, 2019
Finite-Lived Intangible Assets, Gross, Total	$ 21,250				$ 21,250			$ 21,250
Amortization of Intangible Assets, Total	575		$ 210		1,157		$ 420
NB-IoT technologies [Member]
Finite-lived Intangible Assets Acquired				$ 2,800
Finite Lived Intangible Assets Acquired, Balance Not Received				600
Finite-Lived Intangible Assets, Gross, Total	$ 1,961	[1]		$ 2,200	1,961	[1]		1,961	[1]
Intangible Assets Expenditures Incurred but Not yet Paid					$ 210
Amortization of Intangible Assets, Total								$ 239

[1] During the first quarter of 2018, the Company entered into an agreement to invest in certain NB-IoT technologies in the amount of $2,800, of which, technologies valued at $600 has not been received. Of the $2,200, $210 has not resulted in cash outflows as of June 30, 2020. In addition, the Company participated in programs sponsored by the Hong Kong government for the support of the above investment, and as a result, the Company received during 2019 an amount of $239 related to the NB-IoT technologies, which was reduced from the gross carrying amount of intangible assets. The Company recorded the amortization cost of the NB-IoT technologies in "cost of revenues" on the Company's interim condensed consolidated statements of income (loss).