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Note 9 - Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Balance $ (1,009) $ (1,101) $ (1,760) $ (1,151)
Unrealized gain arising during the period 948 (185) 1,699 (135)
Balance (61) (1,286) (61) (1,286)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Balance (1,009) (1,101) (1,760) (1,151)
Unrealized gain arising during the period 948 (185) 1,699 (135)
Balance $ (61) $ (1,286) $ (61) $ (1,286)