Annual report pursuant to Section 13 and 15(d)

Note 1 - Nature of Operations and Accounting Policies - Deferred Revenues (Details)

v3.19.1
Note 1 - Nature of Operations and Accounting Policies - Deferred Revenues (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Balance at beginning of year $ 10,104 $ 6,953 $ 6,953
Revenues deferred during the year 3,600 4,699
Revenues recognized during the year (12,377) (1,548)
Balance at end of year $ 1,327 $ 10,104 $ 6,953