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Note O - Quarterly Financial Information (Unaudited) - Quarterly Financial Information (Details) (USD $)
 3 Months Ended
Mar. 29, 2015
Dec. 28, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Dec. 29, 2013
Sep. 29, 2013
Jun. 30, 2013
Total revenues $ 20,401,000us-gaap_Revenues $ 22,353,000us-gaap_Revenues $ 28,953,000us-gaap_Revenues $ 27,668,000us-gaap_Revenues $ 17,331,000us-gaap_Revenues $ 18,533,000us-gaap_Revenues $ 23,662,000us-gaap_Revenues $ 23,401,000us-gaap_Revenues
Gross profit (a) 2,019,000us-gaap_GrossProfit [1] 2,594,000us-gaap_GrossProfit [1] 4,716,000us-gaap_GrossProfit [1] 4,240,000us-gaap_GrossProfit [1] 2,004,000us-gaap_GrossProfit [1] 2,457,000us-gaap_GrossProfit [1] 4,513,000us-gaap_GrossProfit [1] 3,475,000us-gaap_GrossProfit [1]
Net income 1,537,000us-gaap_NetIncomeLoss 2,241,000us-gaap_NetIncomeLoss 3,854,000us-gaap_NetIncomeLoss 4,071,000us-gaap_NetIncomeLoss 1,218,000us-gaap_NetIncomeLoss 1,107,000us-gaap_NetIncomeLoss 2,648,000us-gaap_NetIncomeLoss 3,354,000us-gaap_NetIncomeLoss
Net income per share                
Basic calculation (in dollars per share) $ 0.34us-gaap_EarningsPerShareBasic [2] $ 0.50us-gaap_EarningsPerShareBasic [2] $ 0.86us-gaap_EarningsPerShareBasic [2] $ 0.91us-gaap_EarningsPerShareBasic [2] $ 0.27us-gaap_EarningsPerShareBasic [2] $ 0.25us-gaap_EarningsPerShareBasic [2] $ 0.59us-gaap_EarningsPerShareBasic [2] $ 0.76us-gaap_EarningsPerShareBasic [2]
Diluted calculation (in dollars per share) $ 0.34us-gaap_EarningsPerShareDiluted [2] $ 0.49us-gaap_EarningsPerShareDiluted [2] $ 0.84us-gaap_EarningsPerShareDiluted [2] $ 0.89us-gaap_EarningsPerShareDiluted [2] $ 0.27us-gaap_EarningsPerShareDiluted [2] $ 0.24us-gaap_EarningsPerShareDiluted [2] $ 0.57us-gaap_EarningsPerShareDiluted [2] $ 0.73us-gaap_EarningsPerShareDiluted [2]
Shares used in computation of net income per share                
Basic (b) (in shares) 4,521,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2] 4,482,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2] 4,472,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2] 4,471,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2] 4,459,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2] 4,466,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2] 4,460,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2] 4,415,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [2]
Diluted (b) (in shares) 4,562,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [2] 4,603,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [2] 4,593,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [2] 4,593,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [2] 4,594,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [2] 4,622,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [2] 4,625,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [2] 4,588,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [2]
Total revenues 20,401,000us-gaap_Revenues 22,353,000us-gaap_Revenues 28,953,000us-gaap_Revenues 27,668,000us-gaap_Revenues 17,331,000us-gaap_Revenues 18,533,000us-gaap_Revenues 23,662,000us-gaap_Revenues 23,401,000us-gaap_Revenues
Gross profit (a) 2,019,000us-gaap_GrossProfit [1] 2,594,000us-gaap_GrossProfit [1] 4,716,000us-gaap_GrossProfit [1] 4,240,000us-gaap_GrossProfit [1] 2,004,000us-gaap_GrossProfit [1] 2,457,000us-gaap_GrossProfit [1] 4,513,000us-gaap_GrossProfit [1] 3,475,000us-gaap_GrossProfit [1]
Net income $ 1,537,000us-gaap_NetIncomeLoss $ 2,241,000us-gaap_NetIncomeLoss $ 3,854,000us-gaap_NetIncomeLoss $ 4,071,000us-gaap_NetIncomeLoss $ 1,218,000us-gaap_NetIncomeLoss $ 1,107,000us-gaap_NetIncomeLoss $ 2,648,000us-gaap_NetIncomeLoss $ 3,354,000us-gaap_NetIncomeLoss
[1] Gross profit represents the difference between sales and cost of sales.
[2] The sum of the quarters may not equal the full year per share amounts included in the accompanying consolidated statements of earnings due to the effect of the weighted average number of shares outstanding during the fiscal years as compared to the quarters.