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Note 17 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
Mar. 31, 2017
Mar. 31, 2016
Inventory reserves $ 785,000 $ 504,000
Accrued vacation 475,000 439,000
Stock option compensation 108,000 141,000
Property and equipment 169,000
Warranty reserve 39,000 74,000
Accounts and notes receivable reserve 290,000 181,000
Employee severance reserve 460,000
Net operating loss carryforwards 6,461,000 5,353,000
Federal/Canadian tax credits 4,648,000 4,784,000
263A inventory capitalization 10,000 60,000
Unrealized gains/losses and outside basis difference for CFC's 1,995,000
Intangibles 43,000
Other 78,000 112,000
Total deferred tax assets 15,561,000 11,648,000
Deferred revenue (35,000) (52,000)
Prepaid expenses (505,000) (563,000)
Property and equipment (70,000)
Intangibles (388,000)
Gain on marketable securities (OCI) (94,000)
Outside basis difference (34,000)
Total deferred tax liabilities (668,000) (1,073,000)
Net deferred tax asset (liability) 14,893,000 10,575,000
Less valuation allowance (14,698,000) (10,830,000)
Net deferred tax asset (liability) after valuation allowance $ 195,000  
Net deferred tax asset (liability) after valuation allowance   $ (255,000)