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Note 10 - Income Taxes (Tables) | 12 Months Ended
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Mar. 31, 2015
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
|  | Year Ended March 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Domestic |  | $ | 14,896 |  |  | $ | 13,103 |  |  | $ | 12,978 |
Foreign |  |  | 451 |  |  |  | -- |  |  |  | -- |
|  | $ | 15,347 |  |  | $ | 13,103 |  |  | $ | 12,978 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | Year Ended March 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Current tax provision |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 4,186 |  |  | $ | 4,031 |  |  | $ | 4,440 |
State |  |  | 1,135 |  |  |  | 106 |  |  |  | 280 |
Foreign |  |  | 212 |  |  |  | -- |  |  |  | -- |
|  |  | 5,533 |  |  |  | 4,137 |  |  |  | 4,720 |
Deferred tax provision: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 252 |  |  |  | (19 | ) |  |  | (180 | )
State |  |  | 51 |  |  |  | (15 | ) |  |  | (12 | )
Foreign |  |  | (72 | ) |  |  | -- |  |  |  | -- |
|  |  | 231 |  |  |  | (34 | ) |  |  | (192 | )
|  | $ | 5,764 |  |  | $ | 4,103 |  |  | $ | 4,528 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | March 31, |
|  | 201 5 |  |  | 201 4 |
Current deferred tax assets: |  |  |  |  |  |  |  |
Accrued employee-related expenses |  | $ | 252 |  |  | $ | 298 |
Allowances and reserves |  |  | 346 |  |  |  | 701 |
Stock option deductible differences |  |  | 388 |  |  |  | 301 |
Inventory |  |  | 252 |  |  |  | 281 |
Foreign tax credit mirror |  |  | 285 |  |  |  | -- |
Currency translation adjustment |  |  | 144 |  |  |  | -- |
Net operating loss |  |  | 22 |  |  |  | 297 |
|  |  | 1,689 |  |  |  | 1,878 |
Long-term deferred tax liability: |  |  |  |  |  |  |  |
Property, plant and equipment |  |  | (1,478 | ) |  |  | (1,434 | )
Goodwill and intangible assets |  |  | (3,644 | ) |  |  | (3,453 | )
Net operating loss |  |  | -- |  |  |  | 26 |
|  |  | (5,122 | ) |  |  | (4,861 | )
Net deferred tax liability |  | $ | (3,433 | ) |  | $ | (2,983 | )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year Ended March 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Federal income taxes at statutory rates |  | $ | 5,374 |  |  | $ | 4,586 |  |  | $ | 4,543 |
State income taxes, net of federal benefit |  |  | 860 |  |  |  | 78 |  |  |  | 158 |
Tax benefit of stock option exercises |  |  | 209 |  |  |  | 5 |  |  |  | 197 |
Section 199 manufacturing deduction |  |  | (317 | ) |  |  | (250 | ) |  |  | (357 | )
Research and development credit |  |  | (248 | ) |  |  | (159 | ) |  |  | (41 | )
Other |  |  | (114 | ) |  |  | (157 | ) |  |  | 28 |
|  | $ | 5,764 |  |  | $ | 4,103 |  |  | $ | 4,528 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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