Note 7 - Intangible Assets, Net (Details Textual) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Mar. 31, 2020		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018
Finite-Lived Intangible Assets, Gross, Total	$ 21,250				$ 21,250
Amortization of Intangible Assets, Total	582		$ 210
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]			1,961	[1]	$ 2,200
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 acquire 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 March 31, 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).