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Consolidated Statements of Stockholders' Equity (USD $) | Common Stock [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Total
--- | --- | --- | --- | --- | --- | ---
BALANCE at Dec. 31, 2011 | $ 26,760 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 5,736,543 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (2,894,068)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 31,181,936 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 382,630 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 34,433,801 us-gaap_StockholdersEquity
BALANCE (in Shares) at Dec. 31, 2011 | 10,156,442 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Shares issued - stock options exercised | 15 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 20,965 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 20,980 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Shares issued - stock options exercised (in Shares) | 6,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  | 6,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Stock-based compensation |  | 10,000 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 10,000 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross
Net income |  |  |  | 5,596,070 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 5,596,070 us-gaap_NetIncomeLoss
Cash dividend paid |  |  |  | (2,536,131)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (2,536,131)us-gaap_DividendsCommonStockCash
Translation adjustment |  |  |  |  | (3,703)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (3,703)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
BALANCE at Dec. 31, 2012 | 26,775 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 5,767,508 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (2,894,068)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 34,241,875 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 378,927 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 37,521,017 us-gaap_StockholdersEquity
BALANCE (in Shares) at Dec. 31, 2012 | 10,162,442 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Shares issued - stock options exercised | 87 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 113,713 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 113,800 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Shares issued - stock options exercised (in Shares) | 36,291 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  | 49,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Stock-based compensation |  | 11,686 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 11,686 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross
Net income |  |  |  | 7,265,717 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 7,265,717 us-gaap_NetIncomeLoss
Translation adjustment |  |  |  |  | (290,678)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (290,678)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
BALANCE at Dec. 31, 2013 | 26,862 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 5,892,907 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (2,894,068)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 41,507,592 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 88,249 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 44,621,542 us-gaap_StockholdersEquity
BALANCE (in Shares) at Dec. 31, 2013 | 10,198,733 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Shares issued - stock options exercised | 29 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 52,693 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 52,722 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Shares issued - stock options exercised (in Shares) | 12,200 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  | 12,200 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Stock-based compensation | 93 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 67,725 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 67,818 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross
Stock-based compensation (in Shares) | 34,601 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Net income |  |  |  | 7,706,921 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 7,706,921 us-gaap_NetIncomeLoss
Cash dividend paid |  |  |  | (2,549,684)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (2,549,684)us-gaap_DividendsCommonStockCash
Translation adjustment |  |  |  |  | (776,307)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (776,307)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
BALANCE at Dec. 31, 2014 | $ 26,984 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 6,013,325 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (2,894,068)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 46,664,829 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (688,058)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 49,123,012 us-gaap_StockholdersEquity
BALANCE (in Shares) at Dec. 31, 2014 | 10,245,534 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |

X
- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,c) -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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