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Note 2 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Unbilled AR, beginning balance $ 2,213 $ 3,016
Deferred Program Costs, beginning balance 318 2,567
Contract Liabilities, beginning balance 15,519 21,937
Deferred Program Costs, increases for costs incurred to fulfill performance obligations 2,153 1,267
Unbilled AR, increase (decrease) due to customer billings (2,926) (7,886)
Increase (decrease) due to customer billings 19,340 7,828
Unbilled AR,Decrease due to cost recognition on completed performance obligations
Deferred Program Costs, decrease due to cost recognition on completed performance obligations (310) (1,033)
Unbilled AR, increase (decrease) due to recognition of revenue based on transfer of control of performance obligations 4,711 7,439
Deferred Program Costs, increase (decrease) due to recognition of revenue based on transfer of control of performance obligations (9)
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations (18,534) (8,296)
Unbilled AR, other changes and FX impact (4) (19)
Deferred Program Costs, other changes and FX impact (9) 24
Other changes and FX impact (313) (864)
Unbilled AR, impact of adoption of ASC 606  
Deferred Program Costs, impact of adoption of ASC 606   (1,599)
Contract Liabilities, impact of adoption of ASC 606   (2,657)
Unbilled AR, ending balance 3,994 2,550
Deferred Program Costs, ending balance 2,152 1,217
Contract Liabilities, ending balance $ 16,012 $ 17,948