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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ / shares in Thousands
Mar. 31, 2018
Dec. 31, 2017
Cash and cash equivalents $ 595,605 $ 181,026
Allowance for doubtful accounts 102,000 114,000
Inventories, net 21,355,107 18,865,932
Prepaid expenses 777,268 887,885
Office furniture and equipment 2,613,300 2,591,159
Goodwill 1,473,176 1,473,176
Net deferred income tax asset 1,373,000 1,102,467
Checks written in excess of bank balance 11,858 454,850
Trade payables 7,196,038 5,414,497
Line of credit 15,925,808 13,783,930
Accrued liabilities $ 2,435,558 $ 2,047,893
Preferred Stock, Par value (in dollars per share) $ 0 $ 0
Preferred Stock, shares authorized (in shares) 3,000,000 3,000,000
Preferred Stock, shares issued (in shares) 0 0
Preferred Stock, shares outstanding (in shares) 0 0
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 15,000,000 15,000,000
Common stock, shares issued (in shares) 3,573,885 3,573,885
Common stock, shares outstanding (in shares) 3,530,227 3,530,227
Treasury stock, shares (in shares) 43,658 43,658
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]    
Cash and cash equivalents $ 65,000 $ 51,000
Inventories, net 465,000 498,000
Prepaid expenses 174,000 80,000
Office furniture and equipment 281,000 268,000
Accumulated depreciation and amortization 56,000 36,000
Goodwill 440,000 440,000
Net deferred income tax asset 62,000 52,000
Checks written in excess of bank balance 12,000 16,000
Trade payables 233,000 144,000
Line of credit 320,000 338,000
Accrued liabilities $ 141,000 $ 92,000