Quarterly report pursuant to Section 13 or 15(d)

Note 1 - Basis of Presentation and Accounting Policies - Deferred Revenues (Details)

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Note 1 - Basis of Presentation and Accounting Policies - Deferred Revenues (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Balance at beginning of period $ 10,104 $ 6,953
Revenues deferred during the period 1,673 2,337
Revenues recognized during the period (1,550)
Balance at end of period $ 10,227 $ 9,290