Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands	Jun. 30, 2018	Dec. 31, 2017
Cash and cash equivalents	$ 452,826	$ 181,026
Allowance for doubtful accounts	100,000	114,000
Inventories, net	19,293,662	18,865,932
Prepaid expenses	672,242	887,885
Office furniture and equipment	2,653,532	2,591,159
Goodwill	1,473,176	1,473,176
Net deferred income tax asset	1,222,447	1,102,467
Checks written in excess of bank balance	8,996	454,850
Trade payables	6,270,221	5,414,497
Line of credit	15,477,581	13,783,930
Accrued liabilities	2,020,762	2,047,893
Notes payable	$ 4,210,950	$ 4,951,581
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	$ 9,000	$ 51,000
Inventories, net	470,000	498,000
Prepaid expenses	131,000	80,000
Office furniture and equipment	298,000	268,000
Accumulated depreciation and amortization	77,000	36,000
Goodwill	440,000	440,000
Net deferred income tax asset	97,000	52,000
Checks written in excess of bank balance	9,000	16,000
Trade payables	159,000	144,000
Line of credit	309,000	338,000
Accrued liabilities	93,000	92,000
Notes payable	$ 52,000	$ 83,000