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Note 15 - Restatement of Financial Statements - Restatement of Financial Statements (Details) (Parentheticals) - USD ($)
$ / shares in Thousands
Jun. 30, 2019
Dec. 31, 2018
Cash and cash equivalents $ 178,298 $ 428,150
Allowance for doubtful accounts 8,398,010 10,830,555
Inventories, net 19,266,094 20,007,488
Prepaid expenses 385,399 858,158
Office furniture and equipment 2,685,450 2,649,280
Accumulated depreciation and amortization 28,623,748 28,120,455
Goodwill 0 1,473,176
Checks written in excess of bank balance 1,030,369 636,142
Trade payables 8,678,165 6,679,670
Line of credit 12,429,643 16,582,963
Accrued liabilities 1,285,064 1,866,796
Notes payable $ 743,675 $ 399,912
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) 3,879,608 3,879,608
Common stock, shares outstanding (in shares) 3,835,950 3,835,950
Treasury stock, shares (in shares) 43,658 43,658
Variable Interest Entity, Primary Beneficiary [Member]    
Cash and cash equivalents $ 57,000  
Allowance for doubtful accounts 85,000  
Inventories, net 340,000  
Prepaid expenses 127,000  
Office furniture and equipment 303,000  
Accumulated depreciation and amortization 104,000  
Goodwill 440,000  
Checks written in excess of bank balance 7,000  
Trade payables 62,000  
Line of credit 267,000  
Accrued liabilities 89,000  
Notes payable 27,000  
Previously Reported [Member]    
Cash and cash equivalents 178,298  
Allowance for doubtful accounts 8,884,291  
Inventories, net 20,519,240  
Prepaid expenses 394,797  
Office furniture and equipment 2,685,450  
Accumulated depreciation and amortization 28,657,592  
Goodwill 1,473,176  
Checks written in excess of bank balance 1,030,369  
Trade payables 8,678,165  
Line of credit 12,429,643  
Accrued liabilities 1,705,380  
Notes payable $ 443,675  
Preferred stock, par value (in dollars per share) $ 0  
Preferred stock, shares authorized (in shares) 3,000,000  
Preferred stock, shares issued (in shares) 0  
Preferred stock, shares outstanding (in shares) 0  
Common stock, no par value (in dollars per share) $ 0  
Common stock, shares authorized (in shares) 15,000,000  
Common stock, shares issued (in shares) 3,879,608  
Common stock, shares outstanding (in shares) 3,835,950  
Treasury stock, shares (in shares) 43,658  
Previously Reported [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Cash and cash equivalents $ 2,000  
Allowance for doubtful accounts 515,000  
Inventories, net 242,000  
Prepaid expenses 106,000  
Office furniture and equipment 303,000  
Accumulated depreciation and amortization 107,000  
Goodwill 0  
Checks written in excess of bank balance 2,000  
Trade payables 77,000  
Line of credit 232,000  
Accrued liabilities 35,000  
Notes payable 30,000  
Revision of Prior Period, Adjustment [Member]    
Cash and cash equivalents  
Allowance for doubtful accounts (486,281)  
Inventories, net (1,253,146)  
Prepaid expenses (9,398)  
Office furniture and equipment  
Accumulated depreciation and amortization (33,844)  
Goodwill (1,473,176)  
Checks written in excess of bank balance  
Trade payables  
Line of credit  
Accrued liabilities (420,316)  
Notes payable $ 300,000  
Preferred stock, par value (in dollars per share)  
Preferred stock, shares authorized (in shares)  
Preferred stock, shares issued (in shares)  
Preferred stock, shares outstanding (in shares)  
Common stock, no par value (in dollars per share)  
Common stock, shares authorized (in shares)  
Common stock, shares issued (in shares)  
Common stock, shares outstanding (in shares)  
Treasury stock, shares (in shares)  
Revision of Prior Period, Adjustment [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Cash and cash equivalents  
Allowance for doubtful accounts  
Inventories, net  
Prepaid expenses  
Office furniture and equipment  
Accumulated depreciation and amortization  
Goodwill  
Checks written in excess of bank balance  
Trade payables  
Line of credit  
Accrued liabilities  
Notes payable