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Note 8 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  |  | 201 6 |  |  | 201 5 |  |  | 201 4 |
Current provision: |  |  |  |  |  |  |  |  |  |  |  |  |
| Federal |  | $ | 3,108,894 |  |  | $ | 3,045,292 |  |  | $ | 3,368,974 |
| State |  |  | 486,565 |  |  |  | 482,186 |  |  |  | 548,225 |
|  |  |  | 3,595,459 |  |  |  | 3,527,478 |  |  |  | 3,917,199 |
Deferred provision (benefit): |  |  |  |  |  |  |  |  |  |  |  |  |
| Federal |  |  | 183,520 |  |  |  | 212,563 |  |  |  | 210,343 |
| State |  |  | 21,591 |  |  |  | 76,607 |  |  |  | (26,853 | )
|  |  |  | 205,111 |  |  |  | 289,170 |  |  |  | 183,490 |
|  |  | $ | 3,800,570 |  |  | $ | 3,816,648 |  |  | $ | 4,100,689 |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
|  | 201 6 |  |  | 201 5 |  |  | 201 4 |
United States |  | $ | 9,070,894 |  |  | $ | 9,272,854 |  |  | $ | 10,339,632 |
United Kingdom |  |  | (81,987 | ) |  |  | (43,567 | ) |  |  | 557,776 |
Canada |  |  | 1,034,027 |  |  |  | 813,824 |  |  |  | 874,571 |
Australia |  |  | 82,622 |  |  |  | 48,633 |  |  |  | 102,922 |
Spain |  |  | 97,273 |  |  |  | 127,309 |  |  |  | (67,291 | )
|  | $ | 10,202,829 |  |  | $ | 10,219,053 |  |  | $ | 11,807,610 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | 201 6 |  |  | 201 5 |
Deferred income tax assets: |  |  |  |  |  |  |  |
Capitalized inventory costs |  | $ | 265,454 |  |  | $ | 260,385 |
Warrants and share-based compensation |  |  | 44,151 |  |  |  | 44,151 |
Accrued expenses, reserves, and other |  |  | 65,631 |  |  |  | 66,444 |
Total deferred income tax assets |  | $ | 375,236 |  |  | $ | 370,980 |
Deferred income tax liabilities: |  |  |  |  |  |  |  |
Property and equipment depreciation |  | $ | 1,728,265 |  |  | $ | 1,529,397 |
Goodwill and other intangible assets amortization |  |  | 227,767 |  |  |  | 217,268 |
Total deferred income tax liabilities |  | $ | 1,956,032 |  |  | $ | 1,746,665 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | 201 6 |  |  | 201 5 |  |  | 201 4 |
Statutory rate – Federal US income tax |  |  | 34 | % |  |  | 34 | % |  |  | 34 | %
State and local taxes |  |  | 6 | % |  |  | 6 | % |  |  | 5 | %
Non-U.S. income tax at different rates |  |  | - |  |  |  | - |  |  |  | (1 | %)
Domestic production activities deduction |  |  | (1 | %) |  |  | (1 | %) |  |  | (1 | %)
Other, net |  |  | (2 | %) |  |  | (2 | %) |  |  | (2 | %)
Effective rate |  |  | 37 | % |  |  | 37 | % |  |  | 35 | %

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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=65882285&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=65882285&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=65882285&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of income before income tax between domestic and foreign jurisdictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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