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Shareholders Equity (USD $)
Common Stock
Comprehensive Income / Loss
Retained Earnings / Accumulated Deficit
Total
Beginning Balance, Value at Dec. 31, 2011 $ 3,611,461us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 959,604us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
$ 71,277,250us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 75,848,315us-gaap_StockholdersEquity
Beginning Balance, Shares at Dec. 31, 2011 5,341,992us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Shares Canceled or Adjusted (66)UNAM_SharesCanceledOrAdjusted
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Shares Repurchased, Value (11,579)us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  (231,890)us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(243,469)us-gaap_StockRepurchasedDuringPeriodValue
Shares Repurchased, Shares (23,497)us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Change in Comprehensive Income, net of Deferred Income Tax   (838,302)UNAM_ChangeInComprehensiveIncomeNetOfDeferredIncomeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
  (838,302)UNAM_ChangeInComprehensiveIncomeNetOfDeferredIncomeTax
Dividends Paid to stockholders'     (6,409,445)us-gaap_Dividends
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(6,409,445)us-gaap_Dividends
Net shares issued for exercise of stock options, Value 46,360us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
    46,360us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Net shares issued for exercise of stock options, Shares 22,718us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Tax benefit from disqualified incentive stock options 16,274UNAM_TaxBenefitFromDisqualifiedIncentiveStockOptions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
    16,274UNAM_TaxBenefitFromDisqualifiedIncentiveStockOptions
Non-cash stock based compensation 23,104us-gaap_ShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
    23,104us-gaap_ShareBasedCompensation
Net Income     1,953,728us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
1,953,728us-gaap_NetIncomeLoss
Ending Balance, Value at Dec. 31, 2012 3,685,620us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
121,302us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
66,589,643us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
70,396,565us-gaap_StockholdersEquity
Ending Balance, Shares at Dec. 31, 2012 5,341,147us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Change in Comprehensive Income, net of Deferred Income Tax   (127,082)UNAM_ChangeInComprehensiveIncomeNetOfDeferredIncomeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
  (127,082)UNAM_ChangeInComprehensiveIncomeNetOfDeferredIncomeTax
Non-cash stock based compensation 23,104us-gaap_ShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
    23,104us-gaap_ShareBasedCompensation
Net Income     603,668us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
603,668us-gaap_NetIncomeLoss
Ending Balance, Value at Dec. 31, 2013 3,708,724us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(5,780)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
67,193,311us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
70,896,255us-gaap_StockholdersEquity
Ending Balance, Shares at Dec. 31, 2013 5,341,147us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Change in Comprehensive Income, net of Deferred Income Tax   9,374UNAM_ChangeInComprehensiveIncomeNetOfDeferredIncomeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
  9,374UNAM_ChangeInComprehensiveIncomeNetOfDeferredIncomeTax
Non-cash stock based compensation 23,104us-gaap_ShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
    23,104us-gaap_ShareBasedCompensation
Net Income     846,361us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
846,361us-gaap_NetIncomeLoss
Ending Balance, Value at Dec. 31, 2014 $ 3,731,828us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 3,594us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
$ 68,036,672us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 71,775,094us-gaap_StockholdersEquity
Ending Balance, Shares at Dec. 31, 2014 5,341,147us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember