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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)

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from severance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from warranty reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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