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Note 3 - Equipment and Leasehold Improvements, Net - Components of Equipment and Leasehold Improvements (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Equipment and leasehold improvements, gross $ 32,749 $ 32,531
Less accumulated depreciation and amortization (17,821) (17,346)
Construction-in-progress 504 549
Equipment and leasehold improvements, net 15,432 15,734
Equipment [Member]    
Equipment and leasehold improvements, gross [1] 18,114 17,935
Leasehold Improvements [Member]    
Equipment and leasehold improvements, gross 14,287 14,248
Furniture and Fixtures [Member]    
Equipment and leasehold improvements, gross $ 348 $ 348
[1] Includes $373,000 of equipment under capital lease at March 31, 2018 and 2017 respectively, with accumulated amortization of $175,000 and $106,000, respectively.